Or HLSHing. Stands for Hitting Low, Scoring High. This happens when one (H)its on a (L)ow rated or not-so-pretty girl and (S)cores (H)igh by having sex with that girl.
1) Noun. -Hillsher
2) Verb. -to Hillsh
1) Boy 1: DAMN! His girlfriend is hella hurt!
Boy 2: Nah, he's just being a hillsher.
2) Boy 1: That kid dates ugly girls too much, he's probably hillshing all of them.