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1.
The discharge of waste matter from the large intestine; defecation. In other words, taking a shit.
My mom calls me at work to check if I had a healthy bowel movement.
av Wolowitz' Mother 28 december 2011
 
2.
bowel movement means doing someones mum up the backside the she shits on your chest
Me - I did Bowel Movements with your mum last night

Liam- Really?!

Me - Yeah! she shat on my chest :O ^^ XD
av MattyC575 10 februari 2009