The act of filling the top reservoir of someones toilet with liquid feces. Preferably, after the mass consumption of spicy foods such as vindaloo or chili.
Oh my god, an Upper Decker Demolator! I keep flushing and it keeps coming back!! Ok, you keep flushing, I'm going for more bleach. And some mints, in case you have to siphon it out...
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Woman (or man) who has breasts, but also has a ring of fat over the top of the pants, giving the illusion that they have two rows of breasts.
Check that out, she's got double decker tits! So big that they had to make her a double decker.
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an idea so dumb or bad, nobody would think it could possibly be useful.
-Metalbeard (The Lego Movie)
-Did you hear about the marketing idea Joe pitched to the execs today?
-Yeah man....a complete double-decker couch. I feel embarrassed for him. We're not actually considering it, are we?
When you get your date home and realise you don't have any condoms but do have a but plug.
The butt plug is placed in her vagina and you proceed to have anal intercourse.
"I wasn't ready to be a dad, so we did the emergency double decker
When one takes a dump on another person's body (like a steamer) but followed by another person taking a dump on the original dump. More is better...
After completing the steamer, she needed more so I asked my buddy to give her a double decker steamer.
A person who exceeds the usual pre-requisites for being a jerk, and is further characterized by pompous indignation at any inferred criticism. These people are facinated with the smell of their own poops.
Carl, the quintesential triple decker turdpie, never returned phone calls from people he suspected mocked him, and preferred the bathroom to the company of others.
A simultaneously prolapsing asshole and vagina of a woman after double penetration sex.
Yo dude Sandra had a "Double Decker Sandwhich" after I banged her with Tyrone.