The act of having phone sex with someone. While the actual sex act would be considered "tapping that ass," oral intercourse constitutes of "phone tapping" that ass.
"So how's it going with that chick you've been sexing over the phone?"
"Oh, I was totally phone tapping that ass last night. We were having phone sex for at least two hours!"
If you notice you gettin a little bigga in da game, and you aint robbin or boostin, you standin ova the stove like the chef in houston, then you need to neva talk on the phone. Slangin all day, and peiceing the ounce out, how ya gon be a birdman if you dont know how ta count..
YoungBuck-"They wanna know whos doin the yap yappin, so they tappin up the phones"
Young Jeezy-"We don' talk on the phones cuz it might stick."
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.