The loosening of the anus after a girl has copious amounts of anal sex.
I went home with that skank from the club and when I stuck it in her ass, I found out she had a total mush tush!
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A thick diarrhea that sticks to your tush cheeks
Bro that brownie sundae gave me crazy tush mush
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A very soft (mushy) bowel movement in which an individual wipes their anus over and over again without any great success, resulting in an itchy butt, and the use of a whole roll of toilet paper.
Dude! Why is it that you always get mush tush at my house?! You owe me some Charmin you stinky bastard!