To not be a simp is not to give your non sexual attention, money, time, and energy for free in hopes of getting something in return, whatever if that’s sex, a relationship, approval or just to be acknowledged.
Too many pathetic men are going out of their way just to be acknowledged by a woman they find attractive. Whatever if that’s complimenting them on social media while getting ignored, buying them gifts from their amazon wishlist while she doesn’t give them the time of day, or just being a good “friend” while her boyfriends and fuck buddies fuck her later on. That’s why the word “simp” came into existence.
The mgtow community over use the word to shame men who commit this toxic behavior, so they can take power away from women and make men more masculine.