get to first with someone
get to first base with (someone)
slang To kiss someone. The term likens sexual acts to "hits" in baseball, in which a player advances to each base on the way to "scoring"—a slang term for engaging in sexual intercourse with someone. A: "Did you get to first base with Dave last night?" B: "A lady doesn't kiss and tell!"
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
get to first with someoneverb
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.