A game usually played at large parties consisting of one playing card. A group sits boy-girl, boy-girl (unless it's a homosexual party) and, using only the card, transport it from person to person using only the mouth. You "suck" the card when recieving it, and you "blow" the card when giving it to the next person. It's like kissing with a card in-between your lips. Not as easy as it sounds.
Lori: Hey, anybody wanna play suck 'n blow?
Tommy: you know I do.