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1.
1) A Manon is a teenage girl who jumps out of moving cars

2) Manon is also a French character from the film "Manon"
1) person 1: Jeez! did she just jump out of that moving car?

person 2: yep, she is a total Manon

2) j'aime tu, Manon!
by tashaf29 October 27, 2009
 
2.
A football term.
When there is an oppostion player behind the payer with the ball, the crowd and other players shout "man on" to warn him of the oppostion player's proximity.
"Campo! man on, man on"
by Julia January 22, 2004
 
3.
necrophiliac french girl with secret intentions
"I left my boyfriend Sergio for that manon."
"That barbie with the antique high heel red doll shoes is such a manon"
by electra April 01, 2005
 
5.
"MANON!" is shouted to warn other classmates of a teacher coming.
*There is no teacher in the class, and everyone is messing about*
*Zane sees a teacher in the corridor*
Zane: "MANON!"
by SUBWAYSTAR July 08, 2009