When someone reads a blackberry message (or text) you sent them that clearly demands a response, but they don't respond. They just leave you with that dirty little R.
===an example of the dirty R in action===

Jill:

R√ Ok I'll be over in a bit! 9:08pm

Joe:

R√ Where are you? 9:37pm

R√ Are you still coming over tonight?? 10:22pm

R√ Wtf?! I'm waiting for you to start the movie! 10:24pm

D√ Don't just give me that dirty R! 10:25pm

D√ Bitch. 10:25pm
by rzm83 December 21, 2010
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When a very rude person decides to leave their read receipts on, reads your message and then decides not to respond...
You just dirty r'd me!
by Sammycherry September 26, 2014
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Reno, Nevada
The biggest little city

A fast growing city filled with crazy college students, crack heads, Gs and hicks
#1: Ay bro, what’s the move this weekend?

#2: I’m sliding to the Dirty R on Friday
#1: Oh shit, you goin to Reno? Shiiiit slime, have a bomb ass time
by Thefukintreemeister June 25, 2018
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When you Urinate and Poo in an container, Take a shower in it and fornicate in it with your S/O or tinder date.
"Hey Shirly, wanna do a Dirty R. Kelly?"
by NathaniSan July 3, 2019
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