Dirty McDonald 

1)The act of eating a Spermburger. (see spermburger)

2)When someone gives a rim job after busting in a girl's ass.

My friend gave a girl a Dirty Mcdonald.

Dirty McDonald by jasom February 9, 2004

dirty macdonald 

A dirty MacDonald is when you have sex with your best friends sister and finish in her hair

I gave dans sister a dirty MacDonald took 3 hours to wash that dried cum out her hair

dirty macdonald by Macfuck April 15, 2020