Top Definition
A playful name for breasts, joining mammaries with moo (in relation to cow utterances). An expectant father may use this name affectionately for his woman's lactating breasts.
Jim was feeling frisky when he saw his wife alone at the kitchen sink. The kids were nowhere to be seen. He slid up behind her and squeezed her rack.
"Come on, show me your mammoos..."
by Nick Estes March 15, 2006

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