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1.
When a person shits in thier wetsuit while paddleing a surfboard out to the line up
Peter gambled and lost, and thus has mushy shatass
by downtiggidy August 17, 2003
 
2.
(adj.) The description of when one drops a load in his/her wetsuit.
Fuck, i have the worst case of mushy shat ass.
by Sabo August 16, 2003