1 definition by Invented at Avon Grove High

Having one person after another poop in a toilet till the point where the poop mountain peaks just above the rim of the toilet.

Topping you off is referred to as topping off someone else's dookie.

The expression "top you off" can also be said to mean something of the same, metaphorically, as a joke.
"The kids at the school topped off the toilet in the band-wing so high that the toilet wouldn't flush. Having never experienced anything like this, the janitor had to call for back up to scoop out the ever-ending pile of shit. This phenomenon created the art of topping off."
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