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Hot tub which has had some form of soap product added to create a large mousse on top of the tub.

The mousse can then be used for making interesting forms or hiding in for performing covert tub maneuvers.
"Hey we gonna mousse the tub tonight"

"For sure got my pockets full of Mr Matey bubble bath"

"Alright, mousse tub time"
by WESN321 April 30, 2010