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Nathan Fillion uses the phrase Full On. Its short form is: FO. It is often used in conjunction with phrases such as: Double Rainbow, Double Rainbow, All The Way, and Double Rainbow, All The Way Across The Sky.

It means that which is:

•fully ecstatically wondrous

•beyond joyfully amazing

•intensely orgasmically blissful
Here are some usage examples for Full On. (For more examples, see the Twitter page belonging to NathanFillion:)

Nathan Fillion, on his Twitter page, kindly acknowledged my entry work defining his recommendation of the new "in" phrase: "Double Rainbow" on Urban Dictionary! He said it is "Full on." Thank you, Nathan. You are so Full On Double Rainbow, All The Way Across The Sky! (FO DR ATW ATS!) (See also: FODRATWATS)

The TV shows Castle and Firefly are so intense, they are Full On Double Rainbow!.

Serenity, the feature film starring Nathan Fillion, is so vivid, it's Full On Double Rainbow!

Nathan Fillion is so awesomely spectacular, sexyhotmessgorgeous, and brilliantly talented, his fame is sweeping across the nation, and over all the world! Nathan Fillion is Full On Double Rainbow, All The Way Across The Sky!
Full On by Kcat10 August 2, 2010
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"Did you see how much of a curly headed fuck levi is?"

"Yea hes pretty full on"
Full on by T_WKN_2010 October 10, 2009
n.
British slang term for a woman being on her period.
Get me some bloody chocolate, I'm full-on this week!
Full On by Wendy Lane 3/4 November 18, 2004
Full on: from the idea of a water faucet being turned fully on, full on means to not hold back, to have no reservations, particularly in a relationship.
I'm sorry, I know I'm a bit full on. If I like a guy, I like him. I don't play hard to get.
Full on by Sister Nich September 1, 2019

Full-on Pata-chub 

A massive, throbbing chub brought on by experiencing Patagonia with any of the five senses.
Ben linked me to the M's Capilene 4 Expedition Weight 1/4-Zip Hoody; I was instantly at full-on Pata-chub.
Full-on Pata-chub by 1LSLS January 15, 2013

Full On Bombsicle 

Radically hot chick. A fine sexy female.
That cute ass honey over there is a full on bombsicle.

Full on social teen

A teen who wastes their day or 90% of it texting or talking to another teen; someone who thinks they are being social but are actually the complete opposite
I think that guy in the corner, alone, on his phone is a full on social teen.