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1.
Bra, used by a pimp in one of the Dirty Harry movies before he searches a prostitute's bra for hidden money.
Let's see what you got here in the titty bag.
by Col. Dr. April 23, 2006
 
2.
A variation of man boobs, which sag and look more deflated than the standard boobs. Usually seen between states of significant weight loss.
-Look at Trevor over there by the pool!

-Eww, titty bags.
by Northbullittboy February 28, 2010