A saying mainly used by Roblox kids. By saying "mic up" it means that they want to voice chat using an app called Discord. It is mainly used in aggressive fights in Roblox games.

You probably go on ROBLOX on "Da Hood" or "The Streets" and say "Mic up psy!"

used by ro gangsters when they are mad as fuck
or used my roblox trolls

Mic up means "wanna voice chat kid"
Uses in every roblox games
If you're nine your probably uses this word

9 year old
Mic up kid
No
Scared
Alright let mic up
No sorry I can't rn

a tern used by (usually) robloxians. when someone says this to you, most times out of 10, they are trying to pack you. if not, someone is just trying to chill in a call with you. micing up is like a less dominate version of squaring up, but they are pretty much the same, you find your opponent, then pack until someone wins.

Mic-up is a word generally used by individuals described as "Rogangsters" which are typically 12 year-olds whom dress up like the ideal thug but in ROBLOX.

The word itself means literally to "mic-up" as into get into a verbal argument with them, usually over Discord. They use this phrase when they have no come back in a text argument.