Acoustic

Seeing a pair of boobs with no bra. A naked pair of breasts.

Ralph: "Wow, Jenny sure does have nice boobs!"
Rodney: "They're not great acoustic though man. Big let downs..."

Flip the Chimp

Flipping someone off with both hands whilst pulling a angry face and making a loud noise (usually a chimp noise).

Andy: "Dude I think Barry is gonna flip the chimp at you"
Paul: "Son of a bitch, so he is!"

Barry: "ahrghhha!"

Suck a shit

Used to express your anger at someone when they have annoyed you.

Johnson: "Nice t-shirt faggot"
Alberto: "Suck a shit Johnson, suck a shit!"

Flacctibation

Masturbating with a flaccid penis...

I tried to wank last night - but I never got past preliminary flacctibation