simp withdrawal

When you haven't simped for a girl in a long time and it's making you go crazy. Symptoms include fast heartbeat, mood swings, and being frazzled for long periods of time

Jeremy: Which girl is Zach simping for now?
Anne: He actually said he's done with simping, but I know he won't be able to stop forever
Jeremy: Oh is that why he's been acting super discombobulated recently?
Anne: Yeah, I think he's going through simp withdrawal now