To check your actions before you go off and do something stupid, and Shrek the almighty ogre lord decides to kill you.
Man: I hear investing in bitcoin is the way to go nowadays
Man's friend: Check yourself, before you Shrek yourself
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Stepping back and looking at your actions before daring to enter Shreks swamp.
Idiot: Man this forest looks nice i think its where shrek lives! Lets investigate.
Me:Bro you better check yourself before you shrek yourself
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Take a chill pill and look at your actions. Examine what you're next action because right now, you're heading in a bad direction.
Person: I think I'll go see La La Land!
Me: Check yourself before you shrek yourself, dickhead.
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