It's a reference to either:
1. A rocket launcher
2. A helicopter
But also can be used for fun.
Helicopters make a soi soi soi kinda noise so saying pharses like the one in the example explains it, the rofl is added on just to make it seem kiddish and funny.
Eg. My Roflcopter goes soi soi soi soi soi (as you spin around with a rocket launcher or just because helicopters make a soi noise)
od uživatele Xurtz 04. září 2010
It is when you are rolling around on the floor laughing that you attempt to run in circles making your legs seem like the blades of a helicopter.
STEP ONE: Lay on the ground and laugh while rolling.
STEP TWO: Start moving your legs in a forward direction, as if to walk, making sure your shoes catch enough of the floor to turn in the desired direction.
STEP THREE: Keep repeating step two until point is taken.
------When to do it-----
When something sends you into histarics you may proceed to roflcopter
od uživatele Rawr Baby Rawrr. 24. únor 2009
Rolling on ground luaghing so hard then spinning to resemble a helicopter,(Roflcopter)

Armenants of the Roflcopter:
1.Roflamomissles:Most powerful missle ever
2.LMAO Missles:Standard Roflcopter missles
3.lolRockets:Small weak rockets
4.LoLer Cannon:Its just a big machine gun
5.F-Bombs:Use these if you want to quickly silence the place
6.Lmaolemons:is fuel for roflcopter
Just 3 nights ago a squad of 5 armed roflcopters broke into a chatroom full of nerds and ended the nerdyness with 20 Roflmaomissles and 5 F-bombs along with numerous lolrockets
od uživatele NinjaWolf750 12. březen 2009
During sex when the female is on top facing up and the male beneath, the female will proceed to throw a temper tantrum with her arms and legs flailing wildy while yelling, "Je vais le bonbon!" very loudly
"This one chick decided to roflcopter on me and I was so confused like a sheep because I didn't know what was going on."
od uživatele e-wang 21. únor 2008
Originally, roflcopter was just a phrase used by a select group of people with little or no meaning. Eventually, it was adapted by others to mean "Rolling on the floor laughing, sucking Julian's dick." This eventually changed to its present meaning where it is defined as basically anything sexual between two or more people, especially blowjobs or shower/locker room/gay sex.
Hey Joey, what were u doing in the locker room with Soko?

Oh, I was just roflcoptering with him. Sorry we're late for swim practice. What'd you guys do in the meantime?

Yeah, we also got a quick roflcopter in.

That's gay.

I know.
od uživatele lalayak 05. červen 2010
Derived from an interracial porno on the internet. Keyword "roflcopter".

A sex position, where a women lies down doggystyle with her face and chest on the bed while arching her back. The man inserts his penis and proceeds to do 360 spins, using his hands to balance and spin himself on her ass keeping his legs in the air. All while instertion is still fully fledged. Thus, simulating the propeller blade on top of a helicopter.
"C'mon babe let me pull the roflcopter!"
od uživatele dr. pabst 03. prosinec 2009
a replacement for the chat term "lol", used by those in search of better terms to use.
"What a bitch! lol"
"ROFLcopter"
od uživatele BigWangGangBang 16. červen 2009
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