Def. 1: Used to describe something particularly easy, generally a task.
Def.2: Used to describe someone of the opposite sex, particularly in how easy it will be to pick that person up. A sure thing.
origin: beginner's little league game of the same name, where the degree of difficulty in hitting a baseball is reduced by placing it on a tee for the child to hit.
"I know the guy who runs that place, so getting our friends in should be teeball tonight."
A baseball metaphor (along the lines of getting to the plate, to 1st base, to 2nd base... etceteria) for a member of the opposite sex that obviously desires coitus but will not make the first move. He/she is just sitting there and all you have to do is "make contact" and the deal is closed i.e. home run.
A variation on the teabag. A teaball involves 3 people, at least 2 males. Male #1 lowers their balls onto the mouth of Male/Female #2 (who is lying down). Male #3 then tries to hit the balls off using their penis. The activity is similar to that of childhood sport tee-ball, where the balls are the softball, and the penis is the bat.
First used in Toronto, Canada in late March, 2010.
"Vince and Jon were feeling adventurous, so instead of giving Keith a plain old teabag, they decided to sport it up and give him a teaball instead."
Dude I was on a teaball speedballlast night, it wall like a baby version of coke and heroin. I’ll probably move on to actual coke and heroin soon because it was dope.