Busting an O 

Having an orgasm.

This massage felt so good that I almost busted an O.

Or

Brad is in the other room with Kayla; they're busting an O.

Busting an O by PaperTowns September 22, 2010

Bustin' an orlando

When you kill all greens and you were the first one to hit greens.

*While in a smoking session*
Person 1: "Hit the bong dude"
Person 2: "Alright"
*Person 2 smokes all greens*
Person 3: "Wow bustin' an orlando"
Person 1: "Word"
Person 2 "Sorry"

Bustin' an orlando by Pentland Dude October 28, 2012