Someone who keeps on your case to do something, or someone who is being a complete asshole.
"Dude, my manager is being a total ballmaster today."
by Judah126 May 13, 2008
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Having a skilled mastery at handling male genitals
Guy: Bro i am about to ballmaster my boyfriend so hard he's going to love it
by Epicturtl3m4n October 21, 2021
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