An aggressive term used on various ROBLOX games (most notably The Streets) to get an opposing party to proverbially "mic up" by talking to them on an app with voice calling, usually Discord. The term was first used in 2017 by sheddinator when fighting the head of the Ro-Banging gang Re$tort, yn2x.

A jack off buddy (from 'cum' /'come', meaning 'semen', and 'companion'); a friend that you get together with for sessions of solo or mutual masturbation
Variant of: cumpanion (from 'companion' & 'cum'); jack off buddy & wank bud & JO buddy
Similar to: fuck buddy

Mic up means you’re a pressed kid in roblox
You’re 9 if you say this.

what teenagers say when they tryna be all cool around their online friends. To call someone Voice chat Mostly found on Roblox

You’re a pressed kid.

You probably say this in Ragdoll Engine, Club Iris and Arsenal.

A term commonly used to provoke another person into joining a voice chat with the requesting party. This is commonly found in video games when one player becomes angered with another, or both parties are angry with each other.

The term 'mic up' is actually slang for: "i'm a lesbian fur child" in German.

Sometimes you see people use it in games, even in real life! Congratulations, you now just learnt a new definition for a shitty word!