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5.
A small cannon placed on the ground in the manner of a coffee cup. The fuse is placed in the vent hole and flash powder is placed in the main bore. Produces a thunderous explosion and can be refilled time and time again. Thunder mugs have been in use for hundreds of years. Also a name for an under-the-bed toilet from the out house days so people didn't have to venture out at night.
His thunder mug launches golf balls hundreds of yards in the air.

They fired the thunder mug at half-time and I could hear it at the frat house !

Did you hear grandma on the thunder mug last night ?
by Boilerman420 June 15, 2012
 
1.
A large, china mug with a fitting lid that fits under a bed. It is for night-time use when a person does not want to walk downstairs and outside to the kybo.
Mrs. Galloway did not want to go out into the snowstorm, so she used her thunder mug.
by Joao Bufamarillo May 13, 2005
 
2.
a small plastic pail or bucket used during especially long road trips to substitute as a poor man's toilet stop
paul-hey john, how long until the nearest bathroom break?
john-sorry man, we took one when you were sleeping in the car
paul-damn...well someone pass me the thunder mug, i've gotta take a huge dook
by i.am.aquaman June 08, 2004
 
3.
a toilet.
I have to brown down on the thunder mug.
by Colonel Krackers March 13, 2003
 
4.
A toilet. previously the pot inside of the comode console- so named because of its echo chamber effect
" I was sitting on the thundermug and alluhthesudden...' BRRRPOOMMMPPPP-FAZzzzz!'"
by J E. Walker April 26, 2003
 
6.
Toilet.

From the loud noise made when a toilet is flushed.

A good example is the sound effect used on "All In The Family", which had a running joke of the sound of the "terlet" being flushed upstairs.
I woke everyone up early this morning when I flushed the thunder mug!
by OldsVistaCruiser September 10, 2010
 
7.
A drinking vessel of epic proportions, something that only the Gods, NAY only the Axemen would consider worthy of holding their drink. A mug filled with the frothiest of ales that can quench the even the most parched of throats. Some have said that drinking from such a vessel will allow a man to impregnate a women with his musk alone. Footnotes are needed on that last claim
Barkeep: What will it be Sir?
Customer: I want something that will allow me to climb the tallest tower, swim the widest ocean, to verb the adjective noun!
Barkeep: That'll be a Thunder Mug then
by Rudy_Acadia January 28, 2010