When visiting a fast food restaurant one requests a water for their beverage, but after consuming the water and before leaving the individual returns to the drink fountain and decides to get a pop for themselves for the road. The greediness and selfishness of this maneuver turns a normal refill into a "mefill".
I was at Chipotle the other day and I ordered a water to wash down my burrito, but when I was done eating I went to the drink fountain and got a mefill of Coke.
by BigSmooth13 February 25, 2008
Get the mefillmug.