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1.
Used in the case when a person has said a phrase in which was not funny, or used lame comedy, but in which they thought was funny themselves, And is replied with thats what mole man said.
Person - What do you call if you cross a kangaroo and a trampoline.... A wooly jumper

2nd Person - Thats what mole man said

Can be shortened to TWMMS, Usually for online use.
by Mini-Coops January 06, 2011