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1.
A person which is extremely cool but is still nice on the inside.
"hey man, you're a jonno, thanks"
"cant you just be a jonno for once"
by Seth999 September 10, 2009
 
2.
A person of the male gender who is so ridiculously/ extremely hot/ handsome/ good looking that he can make any female wet just by looking at her. Jonnos are known the world over for having the biggest schlongs on average by at least a meter to their closest rivals. Their dongs commonly go by the name of "Russell The One-Eyed Wonder Muscle or Borris The Fur Faced Chicken." They generally have a wingman starting with the letter "B" who is mostly a massive mong with an elfish appearance. Jonnos live for DA BOIZ and follow the rules of "The Bro Code" by the book. You think you're hot?... you obviously haven't met a Jonno yet. They are built like a God and would make Jesus himself cream his pants. They have the rare ability to turn lesbians straight, so watch out Rebecca Black. Jonnos are renowned for their lewse getting abilities and just generally ripping the shit up out of any d-floor which is graced by their presence. Some say that Jonnos are as a whole the greatest football players on the planet, so Ronaldo, Messi and Nico get fucked.
Blake: "Fuck Jonno's a lewse cannon."
Nico: "I know brah and have you seen his dong?"
Huss: "Have you seen my fucking pies?"
Nico: "STFU and answer my question..."
Huss: Nah i haven't seen his knob but word on the street is it's longer than the street..."
Blake " I heard it's named Russell the one-eyed wonder muscle?"
Nico: "I heard it was called Borris the fur-faced chicken?"
Huss: "I couldn't care less i just want a fucking pie with some tomatie sauce!"?
by BK DA MONG May 01, 2011