Meaning - joy, to be happy, laughter and general merriment.
I am full of mirth.
It was a day filled with mirth day.
by ValleyFloydJames August 22, 2005
(v) the act of quietly and secretly enjoying a private joke with yourself, to the point of abdominal pain. (that would be why it rhymes with "birthing").
Chris was mirthing to himself in a corner, giving him the acute appearance of an individual in need of a straitjacket.
by the.kanguru March 14, 2011
A mythical land where humans are not total asshats.
by Type2GenomeManiac June 3, 2017
Mirthe is a complete wacko - she has the weirdest sense of humour and an unnatural love of cats. She constantly flips her hands and hair around, but despite her strange actions, she always attracts the boys.

Often Dutch, has dark brown hair and green eyes, is kind of a midget and constantly hyper. She lights up the room with her happy presence, and is super fun when drunk!

You'll often find her in her bubble bath, drunk dancing or laughing at something which is not amusing in any way. Always has a stash of gum or mints in her bag, and has a candy-crush addiction.
GUY A: Hey, did you see Mirthe last night?

GUY B: Yeah! She was getting stoned with her neighbours cat.

GUY C: Damn, I love that girl.
by inhabitantofhillywood January 23, 2014
full of mirth; merry or amusing
He was a mirthful soul who's thoughts echoed the work of the messiahs themselves
by 780-Gamzee April 19, 2018
Another word for the male genitalia, penis, cock, or shlong. Refereeing specifically to the penis when fully erect. The phrase comes from the word “mirth”, meaning happiness, joy or pleasure, when also combined with “rocket”. Mirth rocket directly translates to “pleasure rocket” which can be interpreted as a slang word for the erect penis.
Hey baby, you want to get some dong bags and hop on the ole mirth rocket.
by skitty April 25, 2008