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 ?
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
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.
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