Here are the possible solutions for full and happy about it clue
Answer
Clue
Relevancy
sated
Clue
Full and happy
Full ... and happy about it
mogwai
Clue
"Happy Songs for Happy People" band
tipsy
Clue
A bit too happy at happy hour?
fonzarelli
Clue
Full last name of a "Happy Days" cool dude
troll
Clue
Sing in a full, happy voice
nature
Clue
It is "full of genius, full of the divinity," per Henry David Thoreau
Definition
the qualities of anything which make it what it is
coral
Clue
Creatures that can't move but have sex by constantly and simultaneously ejaculating on a full moon once a year. It's called "broadcast spawning" and there are videos and they are glorious