Open a Box of Butt Magic

To blatantly let out a loud dank nasty FART! i.e. To pass gas.

*you smell a dirty fart stench in the air then ask...*
"Who just totaly opened a box of butt magic in here?!"
or
"heads up..Im about to open a box of butt magic"

by Derek Simons aka D-rock aka Sir Danks November 11, 2006