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1 definition by Muffin Freak

 
1.
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