Dumptug 

Masturbating whilst sitting on the toilet having a poo

Eeeeeee took a porn mag to the toilet for reading material and decided to have a tug as he was aroused thus he was having a dumptug

Dumptug by Shaggers007 October 19, 2011

Dumptube

A code word called out to alert other males that there is a hot female around. The general idea being that the subject female not know she is the subject. Can be associated with the term gutter slut.

Male A: *calls out* "dumptube"

Male B: *calls back* "checking"

All males in the vicinity are on alert to find this supposed hottie. If it is indeed a false alarm. "Party foul" should be callled.

Dumptube by _madman X_ March 25, 2011

Humpty Dumptus 

The act of performing a number two; a dump; relieving one's bowels

I will be back, I must go perform a humpty dumptus

Humpty Dumptus by TW1ST3R November 28, 2012