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Popularized by the rap group ExMortis, a snackpack is when a woman (usually someone's mother) performs analingus on the rectum of the man while he defecates.
"My ass become a vortex and began to spit faster;
yo mama's face became a national disaster area.
Makin' her face a little scarier,
and my colon drips all night, so you'd better beware"

also

"I ripped off my drawers, and spread my asscrack, and I made that nasty bitch make herself a snackpack"
When a man and a woman are either having sex or just flirting (or anything in between)and the woman assumes a submissive position, most commonly on her knees, then the man jerks-off into the woman's mouth. The woman then swallows his load. Used as a code word in casual conversation and allows for secret requests while in public.
Howard snuck off to give Mary a snackpack at the party.
Blake and Kate laughed when discussing their last snackpack in front of friends.
snackpack by Razorblake33 July 28, 2006

Snackcaked 

To be stood by one or more people other than a date or romantic interest. Usually happens at bars, nightclubs or parties.
I went to meet Mike at The Houndstooth for a beer but that douche snackcaked me.

I was supposed to go to Craig's party last night but I ran into Angie at 7-11. One thing led to another and I snackcaked him, so did Angie.
Snackcaked by Scotty No P August 16, 2012

snack packed 

Sexual act where you literally eat the shit outta someone's anus
Jim: I was just snack packed for the first time. Ber: that's gross! Who would be kinky enough to snack your pack!?!
snack packed by the ber queen August 1, 2013

snackcaked 

the consumption of delicious, high preservative type, foods while intoxicated or high.
"Last night after taking some bong rips, we got totally snackcaked."
snackcaked by Ainston July 10, 2007

Slackpacker

To be a complete slut or whore whilst travelling. Can be used as a derogatory term for males or females as everyone is pretty easy whilst travelling
"Ive heard she's a right slackpacker" or this hostel is crawling with slackpackers
Slackpacker by Hendy :D July 31, 2012