as in HAGS, have a good summer, someone would write this in a yearbook to mean have some good sex
hey man have a great summer and HSGS
An abbreviation which literally refers to High School Girl(s). It can generally be applied to girls who are younger than the law would appreciate. It can be used to cover up talk which might be looked down upon by certain people in the general vicinity.
"Dude did you check out that group on facebook; I Love High School Girls? I fucking love HSG's man!!!"
"Man if it wasn't for HSG's, I might have never made it out of high school, or college, or graduate school, or my mid-life crisis."
Stands for "Head Shaking Good", as in so awesomely amazing. Comparable to orgasm.
High School Girl.
A member of the female gender who is underage and who you would be considered a pedophile for checking out, you sick, sick bastard.
"Hey, check out that girl over there."
"You sick fuck. She's totally an HSG. I oughta report you to Child and Family Services for pederasty."