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2.
The presence of perspiration soaking through one's shirt located under a fat man's breasts, much like that which occurs in the arm pit.
In a hot college basketball stadium:

Student 1: Whoa look at that guy's pit stains.
Student 2: Dude those aren't pit stains, they're tit stains.
by D.Swan December 16, 2008
 
1.
the moist line a fat girl gets between her gut and tits when she sweats. this usually occurs on a hot day. extremely noticable when a bigger girl wears a smaller shirt.
dang...you know its hot out when the big'ns have tit stains.
by heatmat August 30, 2006
 
3.
Someone who really sucks sausages. He walks around thinking hes Jesus but hes really just an idiot.
John is such a titstain. I hate that retard.
by Gary Busey November 18, 2004