YK
YK definition by Slang.net - The Slang Dictionary
This page explains what the acronym "YK" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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Are you financially literate?
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).