the man downstairs

satan, the devil, lucifer, 666, hades, todd howard, whatever you wanna call him.
compare: the man upstairs

me: The end of the world? But you're God! Can't you just undo it?
god: As much as I would love that, my child, the man downstairs wouldn't like it.

definition

The event of something becoming no longer finite

also this

monkeys evolving into humans was the definition of stupidity

oh so

An interjection commonly used to give an adjective a sarcastic and/or mocking tone. Usually used to disguise an insult as a compliment.

playing VRChat
guy 1: *loli avatar*
guy 2: "oh yeah, i just love your avatar. it is oh so cute."

hump day

(When referring to Voltron: Legendary Defender)
The third quintant of the Spicolian movement

Hunk: I don't know. What day is today?
Coran: It's the third quintant of the Spicolian movement. Hump day!

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Whomst

A plural form of whom.
Note that contractions can be combined.

Whomst've'd been pranked before?

Rule 93

See Rule 899

Rule 899 is Rule 93 (this is not)

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Quintant

(Referring to Voltron: Legendary Defender)
"Day" in Altean language

Hunk: I don't know. What day is today?
Coran: It's the third quintant of the Spicolian movement. Hump day!