look up any word, like the eiffel tower:
 
2.
When you know you are going to plan a night of anal sex, to perform anal sex with a partner, male or female
Ye man gonna go dirtboxing with that girl tonight.

Oh she loves dirtboxing, right in the ass

What you been upto this weekend, dirtboxing ?
by Jimmy Mc Anus December 15, 2005
 
1.
Licking an anus.
Ben went out last night and ended up dirt boxing Jennie!
by dirt box dave June 20, 2013