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
Person 2 hears: <mumble> fill er up
by Pottsy2 October 22, 2008
Get the Fill er upmug. by manbeef November 8, 2004
Get the Fill-er-upmug. by Nilam Nad June 20, 2006
Get the Fill 'er Upmug.