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2.
A single shot, serving or mini bottle of booze, the airplane size.

Named for the motion of the head when draining the bottle in a single pull.
Swing by the store and pick up some tip-backs.
by wordonthestreet October 24, 2013
 
1.
To consume amounts of alcohol and or drugs and just relax.
Let's go to Alex's house and have a few beers watch the game and tip back.
by Mikenike January 02, 2014