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1.
An incredibly seductive and sexual being.
She is intelligent and caring, very loving, and a great friend.
She won't take shit from anyone and will make it clear, though she is very open-minded towards almost anything.
She adores the band Coldplay, almost more than she loves her boyfriend, but it's all good because she's his one and only and he loves her more.

2. The act of being extremely sexy.
"Dude, have you seen Yanessa?'
"Yeah bro, she's fucking gorgeous"

"Hey man what's going on?"
"Not much, my girl turned into a Yanessa last night"
"Lucky bastard!"
Yanessa by GianFreako August 12, 2009

yaynessed 

The state of having a lot of yayness, or generally being in a very good mood. It can often result in other people becoming annoyed at the high spirits.
Person A: I'm very yaynessed right now!!!!
Person B: Oh god...
yaynessed by Yaynesssed One May 16, 2008
(interj.) said when expressing happiness!
i got a 100 on my test. YAYNESS!
yayness by jonny December 3, 2002
The unclear language one speaks when yawning
Adam: Gosh am so tired!
Becca: I know, you've been speaking yawnese all night.
yawnese by proffessor010 October 16, 2010
When yay just wont cut it
.....finding 50p in a public toilet
yayness by Adam Smith March 9, 2005
Leo: "Daaaaaang that girl is yannessa."

Greg: "Yeeeaah!, she heella is!"
yannessa by leonpmc January 16, 2011