YK
YK definition by Slang.net
This page explains what the acronym "YK" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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Someone who sends you YK thinks (or hopes) "you're kidding." You're most likely to receive this abbreviation while chatting with friends, family, or co-workers, after sending something they can't quite believe.
If you were kidding in your previous message, you can respond to YK with "yeah, JK" (and probably elaborate). If you weren't kidding, you can respond with "NJ" (and still probably elaborate).