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The term used to tell someone that they should deposit some more petrol in the tank of thier car if you are drugged to the eyballs
Person 1 says: Hey your tank is empty, maybe you should fill er up

Person 2 hears: <mumble> fill er up
by Pottsy2 September 05, 2008
Another way of telling the gas station pumper to eat a fat one.
Gas Station Pumper: Ay, buddy, what you like?
Driver: Stuff it up your turban, bitch!
Gas Station Pumper: Huh? I can't hear you.
Driver: I said, "Filler up!!"
by the Little Kid June 05, 2006
When a man puts his penis into a girls anus and urinates.
She was running a little low, so I had to fill-er-up.
by manbeef November 08, 2004
When having analingus with a lover... Urinate inside her...
Yeah so I totally pulled the Fill 'er Up on my lady friend.
by Nilam Nad June 20, 2006
When one performs an angry dragon and pinchs her noise right before he comes, thus filling her nasal cavity with his load.
Dude, her head nearly exploded when I came and did a Fillerup!
by Famousamos September 20, 2014