A play on the technology term for cell phone "apps"(applications) --similar to the more vulgar version of "tap that ass" or "you wanna tap that?"
I'd like to tap that app
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Telling someone in public or mixed company that you had sex with that girl (or guy) that you had been dating or had your eye's on for awhile.
Guy 1: How did the your date go with the girl you met three weeks ago?
Guy 2: It was awesome. We go back to my place and I got to tap that app.