look up any word, like demiromantic:
 
1.
A time when a form of sexual activity has occured.
Cameron had happy day with kim last night.
by Wudofudo June 25, 2007
 
2.
to be pleased about the current situation, to everything is all good
"england have just won the world cup" says bob
"fuckin happy days" says the fonz
by maximus tentius May 04, 2004
 
3.
A 70's-era American TV series set in the 1950's, and starring, among others, Henry Winkler and Ron Howard. It was a very wholesome, family-oriented show, and was very loved for it's feel-good quality, and overall innocence, and remains quite popular to this day.
"Last night, "Happy Days" was on for 3 hours, and it was fun to watch."
by Katey777 July 24, 2009
 
4.
Something that a complete cock says when he is happy about something.
Man: "I got that girls number for you:
Sox: "oh happy days"
by Kolomboki December 27, 2010
 
5.
when there is a fit girl that walks past.
a fit girl walks past an then someone says "happy days mate" and nods head in direction of girl.
by tom siv June 20, 2007
 
6.
to perform a sexual act
Cameron had happy day with Kim
by Wudofudo July 02, 2007