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Slang for sliding your penis in between a pair of big breasts, IE: titty-fucking. Usually said between friends when a woman with very visible cleavage is within sight.
Jon: So, how did your date with Jill go last night?

Zach: Perfect. We had some nice dinner, then we back to my place and I tit-fucked her until she passed out. I got so into storming the trenches, I had Nam flashbacks.
by Claudio D. May 15, 2012
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