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1.
Referring to having sex with a female.

Comes from the party term, 'to tap a keg'.. where one inserts a tap into a keg and drinks what comes out. But the user is instead tapping an ass.
"Shitttt, I'd tap that ass any day of the week."
by Adam September 22, 2004
 
2.
tap-that
verb
1. to tap something
2. to have sexual intercourse with a girl.
1. I would tap that, but it has a do not tap sign.
2. Damn look at all these fine young ladies, i would tap anyone of them in a heartbeat
by velocity June 08, 2005
 
3.
refering to a guy getting it on with a girl.
i wanna tap that ass.
by john done August 13, 2003
 
4.
When a guy sees someone attractive and wants to have sex with her!
Dang, I wanna tap that shit so bad man!
by Tyler B February 15, 2005
 
5.
this is what a guy might say to a girl if he likes her ass, or if he is turned on by her, likes her body etc.
guy - your HOT. i'd tap that ANYDAY of the week.
girl - tuesday? hehe :P
by NIICOLE; October 23, 2007
 
6.
to "tap that" is when you see a hot guy/girl and you just want to go up to them and start making out or have sex with them

also can be used as tapable (tap-able)
1. did you see that boy go past? man i would so tap that n e day of the week

2.ok fix the hair and lose the shirt an he'd be so tabable

3. boy 1:what about her (point at girl)
boy 2: i'd tap that
by Na'Tasha October 14, 2007
 
7.
= Have sex with him/her/it.

An expression used to declare one's desire to have coitus with someone, coming from the verb 'Tap', which, in this context, is similar and related to screw, i.e. to put a thread on a piece of metal, or to insert said screw into a receptive orifice.
'That' replaces 'him' or 'her', suggesting the receiver of the screwing is just an object, to be sexually used and then cast aside.
"I'd SO tap that!" - By golly, I would very much like to slip my man-servant inside that fine filly!

"Tap thaaaat!" - Holy smokes that person needs a jolly good smashing.

"Would you tap that shit?"
"Indubitably!"
by Dry_Ice July 20, 2012