Top Definition
An anus mouse is a house mouse who's anus is a gaping chasm. He is commonly found perched atop bottles, usually liquor or dish detergent, depending on what he is trying to accomplish. It is undetermined whether or not anus mice can be female, as they have no discernible genitals. All that is known about this is the sad fact they can not give, anus mice will only ever receive.

Fun fact: Anus mice are often found in the company of cocks.
"Oh no, how many times do we have to warn Anus mouse not to sit on the hot sauce."
by Beef Coup November 07, 2011

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