Definitions by DoggyD66

Mack Diesel 

Verb: to go at it, either dry humping or having sex.

Synonyms: bone down, grind, hump, makin' whoopy.

Boy 1: "Where the hell you goin?"

Boy 2: "To Sara's house."

Boy 1: "Mmm Hmmm. You gonna go Mack Diesel!"

Mack Diesel by DoggyD66 January 4, 2010