The act of thought processing while constipated and using the toilet.
Guy 1: Hold on man, Ill be right back, i gotta let out a big one

Guy 2: Alright ill wait

"Goes to washroom and comes back 10 minutes later"

Guy 1: DUDE I JUST THOUGHT OF THE COOLEST WORD!!

Guy 2: Must of been doing some mad Constimplating

Guy 1: Dammit you already got it >.<!
by Spencer Rapson February 26, 2008
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When you are so deep in thought you get the same look as when you are trying to squeeze one out while constipated.
Person 1 - "Give me just a minute to think about this..."

Person 2 - "Dude, it's been 5 minutes. Stop constimplating and make a decision!"
by Drisen November 26, 2016
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