HCFSG 

A meme originated in papillion nebraska in 1998 when a sweater with said acronym made the rounds through the female gymnastics team.

It is a reference to the anatomy of a certain stand out athlete/scholar who would have graduated in 1999.

It is an acronym for "His Cock Feels So Good"

Jessica: Why are you wearing a sweater that says HCFSG?
Sandy: Because my boy is the shit.

HCFSG by MonarchAlum November 1, 2011

hcfsa.aep 

hcfsa.aep is a Video Star and After Affects editor who loves shameless and American Horror Story’s.

Damn hcfsa.aep’s edits are so good.

hcfsa.aep by Coolest here April 3, 2021

HCSG 

Stands for Horse Cock Surgeon Guy. An acronym used to describe someone who words in the surgical field who has an absolutely MASSIVE dick.

Juan: Now I know why they call him HCSG. His dick is HUMONGOUS.
Anesthesiologist: Dude, what the fuck.

HCSG by niggerkneessneeze December 18, 2023