Top definition
A professional caliber knock out; Originated as word suggesting a knock out that is sot hot that she or he is in a league of his or her own.
Babe, you are not just a knock-out, you are pro KO
by Eugene da pro KO May 10, 2003
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