look up any word, like the eiffel tower:
 
3.
A gathering of fanatical mountain bikers spending a day in the woods with hoppity hops (FunDay TM), food, frisbees, and of course bikes, making sick jokes in effort to laugh until accelerade comes out of your nose, and escape adult responsibilities.
Sunday is FunDay.
by Mare45 November 17, 2009
 
1.
An extra day added to the week in an episode of Doug, created by slowing down the Earth's rotation, which is part of the weekend and probably the day after Friday.
I wish there was a real Funday!
by nameless five August 09, 2005
 
2.
a day of the working week where you choose to not work,kick back and relax. funday can replace any day of the week you want.
'tomorrows defo gonna be a funday
by trolotron April 01, 2014
 
4.
created by bunk radcliffe 2006,
the word FUNDAY basically describes.. an awesome day that is just ridiculously fun. FUNDAY is often used in cheers.. and can be altered to fit the activity.
1. FUNDAY ON 3 .. 1 - 2 - 3 .. FUNDAY !!

2. FUN NIGHT ON 3 .. 1 - 2 - 3 .. FUN NIGHT
by radcliffe 2006 August 15, 2006