FSMR 

For some reason.

Usually online but can be in speaking.

He kicked me under the table FSMR and I was like "dude wtf!?"

FSMR by artemisdev February 22, 2020

fsmr 

An acronym to abbreviate "For So Many Reasons". This acronym is typically only used online or during text-message conversations.

*Brendan sends a picture of himself holding a cat*
Angela responds with:"I think this lazy cat pic is my fav so far fsmr."

fsmr by deserialize June 9, 2018