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If said in a cheerful, praising tone, it means "You're doing great, continue the good work!"

If said in a warning tone, it is a threat that means "Stop it right now, or reap the consequences!"

Praise: Wow, you've lost 35 pounds on that diet! Keep it up!

Warning: I have had all I can take of your whining! Do you want a spanking? Keep it up...!
by MistressApril September 06, 2008
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Sarcastic phrase used when one really wants to say something like shove off, fuck off, eat shit, kick rocks, go to hell or simply stop.
Keep it up, we'll see how far that gets you.
by PineappleJuice April 27, 2015
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