Cubing

The act of inserting a piece of lego into the rectum for sexual gratification.

This tends to refer to pieces with at least parallel studs (i.e. 2*2 or 2*4 size pieces.

"Why are you smiling like that Jake? Are you cubing right now?"
"I am cubing all day every day, baby!"

Gowhonker

Someone who practices sniffing used briefs and other crotch related underwear to derive sexual gratification

What bleeding gowhonker has gone and stolen my underwear from the wash?

Gowhonking

The practice of sniffing briefs and other crotch covering undergarments to derive sexual gratification.

Also Gowhonker.

There he goes gowhonking through the neighbor's laundry basket again.