Acronym, Short for 'Man I Fucking Swear'.
Typically used at the start of a
conversation to express
frustration. When applicable, can be in spoken language or written in letters or messages. MIS can also be used for a more
family friendly application, or when the context is not as upsetting.
Bro 1 : "MIFS this girl is
playing games with me, she invited me round for some action, but all we did was play
Call Of Duty.
Bro 2 "That sucks man, in other news, I got laid seventy three times last night and I'm exhausted, so
I'm going to go to bed.