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1.
Tits that are saggy; sinking.
Guy: Dude, look, that bitch has nice tits.

Guy 2: More like tit-tanics.
by Entr' Acte January 15, 2010
 
2.
Gigantically voluptuous breasts, directly opposite to tittles.
Jared: Good God, check out those tit-tanics!
Carl: She could sink an iceberg with those things!
by queermilk September 01, 2010
 
3.
A woman with giant tits(boobs, breast, etc) abnormally large and beautiful tits.
As we walked down the mall we noticed a Tit-tanic and stared at her shamelessly.
by caidoz rellik 666 March 18, 2009