The official renaming of Friday. It's combines the happy expresion of the last day of the week and the day itself.
Yay! It's Yayday!! Tonight we party and tomorrow we sleep in all day!
by ridembob October 28, 2010
1 more definition
noun- term for the 15th of the month, when paychecks are spent on frivolities; orignially from the habit of spending that particular paycheck on drugs ("yayo")
"Today's yayday, so I can get outta the house and into the bar!"
by ChinkJew May 13, 2005