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1.
A dirty wizard is the act of a male having anal sex with a female while she is shitting (as seen on macory.com). He then pulls his dick out and slaps her in the face japap with his dick while yelling "flippendo!" "expelliarmus!" or any other incantation mentioned in the Harry Potter series.
"Expelliarmus!"

...Haha, now you have shit on your face after that dirty wizard
by Mr. Scrotes April 23, 2010
 
2.
a person mostly male with long greasy unwashed hair mostly wear items of clothing like band t-shirts and gamer t-shirts
look at the dirty wizard standing in gamestation
by dirty wizard lover July 06, 2010
 
3.
When one waves their dick around while saying "abracadabra" and then cums on the girl's face.
She won't talk to me since I gave her a dirty wizard.
by danzilla69 November 28, 2009
 
4.
A dirty wizard is when a male is having anal sex with a male or female, pulls his dick out, and right after he cums, disappears.
He told me would love me long time if I let him pound my ass, but he pulled a dirty wizard and I haven't heard from him since.
by Dinosaurasauraus January 26, 2011
 
5.
a deprived, mature looking individual, toe nail teath and a hair disorder.
a dirty wizard is a ugly old man/women/ both, with a greasey beard. a hairy midget. charlotte baker.
by bigbelaidi September 15, 2009
 
6.
A cocktail only drunk at after parties and originally named after a particularly douchey and dull Harry Potter lookalike. The cocktail is made from three ingredients: Jack Daniels, Robinsons Summer Fruit Cordial and tonic water. It is disgusting.
"What did you throw that Dirty Wizard away for, you rotten bitch?" "I'LL FUCKING MAKE YOU ONE IN A MINUTE!"
by GaJa Williams June 24, 2012
 
7.
An ugly old man with grey hair and a long beard. Usually a homeless man or an old git who doesnt know how to keep clean. These type of wizards cannot do magic tricks and dont live in magic castles. These smell old bastards need to be avoided and we should wait till their race eventually dies out.
Kev: ''Haha! seen that homeless man''
Bozzo: '' Yeah he looks like a dirty wizard''
Kev: ''naah, more like a homless santa claus''
Bozzo: '' Dunno like, but the bastard stinks, ill tell you that for free!''
by tosser from stokesley September 12, 2009