When a man is getting a hard-on for another girl, while his significant other is in the area. Applies for the internet or in real life.
Eric was having trouble and getting a bonerdox. While giving his girlfriend directions to the bar, his friend Chelsea was three drinks in and using him as a human strip pole.
When you get done giving the 'olebone to the beaver and you forget to wipe off the excess juices so they crusty and next time you get a boner, the crust snaps off and looks like dust
Kid: "Is someone in this room smoking?"
Me: "No, that's just my bonerdust from this morning... sorry bro!"