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.