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An alternate form of sayin that you (Or someone else) is joking.
Buddy 1 : I got so drunk last night, I took that broads v-card!

Buddy 2 : Your kidding me, you took her down?!

Buddy 1 : No, but you could imagine what it would be like though, right?

Buddy 2 : Oh you sly dog!
by SLK Creighton March 13, 2011