look up any word, like potate:
 
1.
just starting to go out with someone...moved up from bench warmer to batter up...then 1st, 2nd, 3rd etc etc...
hey guess wut? sarah's batter up!!
by *SoFaKiNg* April 19, 2004
 
2.
A drinking technique: the act of taking three shots in quick succession. Usually done by more than one person at a time, for friendly competition. Works fast, obviously.
If she pulls another batter up, she's going to be on the floor in a matter of minutes.

I've never gone a batter up with him before, but I hear he holds it well.
by Dancinfetus October 25, 2006
 
3.
The act of pulling your penis out of your partner's mouth while they're giving you a blowjob - just before climax, sticking it in their ear and shouting "Batter UP!"
"I stuck it in her ear and it was a home-run."
by Diddle January 21, 2004