me using google to know wtf is a X

It means mildly small

mildly small memer group

Yep

12243 followers = mildly small

Mildly small is what it originally meant

bruh

Depends on the context
If it's about time measurement it means millisecond
If it's about MS_memer_group it means menacingly superior

menacingly superior memer group

bro literally just deleted

The "MS" in MS memer group stands for mildly small. This name was because it was originally a group of four people in real life on an imgflip account posting memes. I later became the sole person of the account, and so I decided to make a personal stream naming it after the account's name at the time.

Thank you for coming to my TED talk.