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1.
Also known as "Dave Dunning" is a sexual act in which one performs oral sex on a female's anus.
I was so drunk and all of a sudden I realized he was Dunning me.
by Dave BD January 02, 2008
 
2.
The act of inserting yourself into conversation, many times dropping whatever you are doing in the moment just to be present in other's conversations. Other variations include eavesdropping noticeably, listening in on phone calls while muting yourself, and randomly just sitting in other's private spaces saying nothing.
Dude, don't you have something better to do? Stop Dunning! You don't have to be part of every conversation
by el_dw_jefe June 27, 2013
 
3.
daintly running
Man look at those slim ankles. She must go dunning often!
by lucyfu February 17, 2013
 
4.
The act of driving drunk in Pennsylvania
dude, instead of dunn'ing.... let me take you home
by nuppie June 24, 2011