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1.
As in any sexual euphemism, the act of "sliding clyde" refers to the penetration of a female's erogenous zone(s) with the males erect member.

Despite this phrase acting as a verb, there is in fact a verb and a noun within. The verb being, slide. And the noun being, clyde. The name clyde is representative of said male member, just as the term Johnson, Dick, Willy, etc.
~Two male comrades, Chris and Jeremy, at a bar.

Jeremy: "Damn, those two are sure going at it."

(Jeremy is referencing two young heterosexual individuals engaging in excessive public foreplay)

Chris: "Oh yeah! I guarantee he'll slide clyde tonight."
by CreeperJR January 19, 2012