8
Stupid, clueless. Used as a remark about someone who misses a joke (it goes over their head, like a 747, which is a type of plane)
Person 1: why'd the chicken cross the road?
Person 2: Why?
Person 1: to get to the other side
Person 2: hunh?
Person 1: oh god, 747...
by djfly May 31, 2007
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9
A woman goes down on a man, gets his cum in her mouth, transfers it to his mouth, and then he goes down on her with it in his mouth.
Dude, my girldfriend and I 747ed last night, it was freaky!
by Boing214 January 09, 2006
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