ilysm means I love you so much when somebody texts you something sweet you would say ilysm
alex:hey babe I’m happy to be in your life
lacy: awwww ilysm
by Tiana.unicorn April 20, 2018
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ILYSM stands for: I Lost Your Slutty Mom

Pretty self explanatory if you ask me.
Example 1:
Daniel Howell: "Bro I've got a problem,"

Phil Lester:"What is it bro?"

Daniel Howell: "ILYSM"

Phil Lester: "Fuck bro.. me too."

I have no regrets
by illuminugget March 27, 2018
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