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Adjective. A particularly intense or extreme experience, whether good or bad.
"The party got a bit full-on when those randoms turned up with all that crystal meth."

"He told me he loved me...I've only known him three weeks so it was all a bit full-on."
by Muffin Freak March 02, 2006
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<adverb> British Slang;

1) Synonymous with 'absolute', 'positive', 'total' etc...
"Jonathan is an absolute, full-on knob-head!"
by Stuart Fletcher November 15, 2004
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One of the premier trolls to ever step into the black metal internet circles, and specifically the FMP ring. Known to be absolutely crazy.
"Fullon.... come..... to.. Alberta........"
by Procyon November 29, 2006
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The absolute whole amount of something, maximum quantity or intensity, such as turning a tap on full, it is all go, all happening and 'full on'.
Rents: " How is University?"
You: " It is full on, I have 2 assignments due tomorrow and a 4 hour lab this evening, exams next week, a cold coming on, no money, no food in the house and everything is just FULL ON!"
(oh yes and I forgot to mention my hot date later tonight~ I got the cold, and the cold sore off them as well;)
by Intensity May 22, 2006
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having a strong or wild personality, audacious
Tawny is making out with some random dude and shouting at the boat captain to be a man and speed up. That girl is so full on.
by Carlo R. April 03, 2008
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