Top definition
derived from the verb lactate, this occurs when a man's sweat marks on his shirt are concentrated around his man-boobs
"ew look at those old guys playing basketball"
"aw man, that fat dude is totally mactating"
by woundedgazelle August 13, 2005
Mug icon

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug