Simp is an acronym which stands for "Sucker Idolizing Mediocre P****" It's used in which men show way too much appreciation towards women even when they aren't together. This is often used when men idolize female social media stars.
Person 1-"Dude she is so fine if you'd slap me I'd say thank you" Person 2-"Dude you're a simp bro"
Originally meant a silly or foolish person. As a way to joke around with the homies then it meant someone you would do anything for. But in 2020 now it means someone you have a crush on / a word used to joke with or make fun of someone especially males who compliment women.
1: "haha you are such a simp" like silly or foolish person.2 : "I would simp for__" like it meant someone you would do anything for 3 : " SIMP!!" like pointing someone out / joke with or make fun of someone especially males who compliment women.