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.
"im toppin my girl's dog off. lemme call you back"
"just text me."
"oh yeah, top me off baby"
"you better shut up or im gonna knock you out and top you off"
the act can be represented as itself in the present tense; topping off. booyah grammar kids. im gonna top y'all off