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Used to descripe a girl who is a bit dippy but also a bit mad or eccentric. Friendly mild insult.
Emily: So I locked my housekey in my locker again..
Jas: Your so dappy!
dappy by Last Chancer October 23, 2006
Doing something stupid and/or uneccisary.
Tom: I broke my arm on my trampoline

Louie: Your so dappy!
Dappy by Morsli June 5, 2009
dappy is a term usually associated with certain types of girl. sometimes the person in question may be mad, loony, or in my own experience, a complete nutter.
that kirsten is dappy as fuck
dappy by chaz April 15, 2004
mad, dippy, stupid, silly, eccentric not right in the head or mental. Can be either positive or negative.
1. That girl is so dappy, I tell you. But ya gotta love her She's got a lot of nerve 2 go out wiv a black bloke round ere!(good)

2. That girl is so dappy. She will never see any sense, what a totally unsuitable guy to go out with. She will pay the price for her dappiness.
dappy by rach February 26, 2003
A person that acts cool when they aren't or is unnecessarily loud in a public place.
John: you see that guy over there shouting at random people and acting like he's cool?

Steve: yeah, he's such a dappy
Dappy by deirdre barlow 69 January 24, 2013
A: I raped your sister...

B: you Dappy cunt
Dappy by jnojones October 12, 2011