Mulch Bagging 

It's when a person kills a prostitute (or runaway- someone nobody will miss), has sex with her, and buries the body. Some months later, they dig up the body and put their opened mouth between the deceased's legs while a friend jumps on her stomach. The woman's decaying insides (including the perpetrator's old sperm) spurt into his mouth.

As a threat- If you're not careful, I'ma mulch-bag your sister.

As an insult- You dirty mulch-bagger.

As an activity- "What'd you guys do last night?" "Just a little mulch bagging"

Mulch Bagging by Mulchy McBagggerson September 4, 2009

Mulchbagging 

Apparently...
The act of killing someone, having sex to completion inside the body, burying it, then digging them back up again 3 months later, whereupon you cover the vagina with your mouth and get a trusted friend to jump in the corpse, firing you're own now-stale and possibly now-mouldy semen back into your mouth.
Yee-agh!!!
WTF?????

"That putrid maggot is into MULCHBAGGING 3-month-old corpses..."

Mulchbagging by Totes Hassles April 13, 2023

mulchfagging 

When an avex sucks his own asshole

Hey did you see that avex that was mulchfagging in the tree yesterday

mulchfagging by mulchbagging69 January 23, 2019