Top Definition
When the male recipient of anal sex either doesn't achieve or loses his erection during penetration. As he recieves anal sex his flacid member flops around in a circular manner.
"You are so gay you watched that flop copter until it gained altitude."

"I was really turned on while she was pegging me but i was still spinning a flop copter the whole time."
#whirly gig #lame dick #loosey goosey #whirlygig #lame-on #prostate put-down #prostate massage flacidity
door Mr_Hand 7 november 2009
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