"Playing the bases" is both a term for a relationship that has yet to be defined and a description of what goes on in it.

When two people are fooling around semi-frequently yet have not yet decided whether they want to be in a relationship.
"Hey, what is up with you and Jackie?"

"I do not know man... We are playing the bases."
by Pimpmeister Flex July 3, 2012
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When the bill comes for food or drink, The friend who starts patting himself down searching his jacket and pants for money that he knows isn't there, like a third base coach giving signals to the batter. He's just waiting for the rest of the guys to come up with the bill
As soon as the bill came, Brett was playing 3rd base coach.
by raujero December 10, 2016
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A term heard mostly in northern California, used by all the potheads as slang for smoking pot. It's short for playing baseball.

a pipe is called a bat.
the marijuana is called baseball.

The name could have come about because it's America's Favorite Pastime, or because when smoking with a bunch of friends, when your turn comes, it's called your hit, same as it would be in the sport of baseball.
"Hey man, we're gonna be playing base tonight, wanna join?"

"I'm so base." -high person
"I hit a HOME RUN!" -really high person
by Nuni April 23, 2008
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