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1.
Any sexual act caused by or relating to Katy Perry.
Guy1: Man, last night I did a dirty firework!
Guy2: Yeah man, whenever I watch Katy Perry's music videos I cream myself.
by BabyI'mAFirework June 20, 2011
 
2.
when a couple are preforming a 69 and both participants ignite each others flatus
dude me and the girlfriend just had some Dirty Fireworks
by sargent butthurt January 02, 2012
 
3.
The girl turns her head sideways and you shit in her ear. Then you cockslap her from the under side extremely hard, causing the shit to fly up into the air.
I totally just gave that girl dirty fireworks
by C0ckslapper March 09, 2009