Top Definition
Fellow to drink and chase tail with. Sorta like a wingman. However, a baserunner will assist in getting wasted as well as the pursuit of pussy.
There is no female equivalent.
"Damn son, you need to get yo'self a baserunner if you gonna scare up some game. It ain't playin' to roll one-deep!"
by Pr0nD0 March 03, 2009

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