When a girl gives a guy a blowjob whilst they are packing a fat lip (of dip, aka chewing tobacco)
"Trisha gave me a Sloppy Dallas last night"
A sloppy dallas is when a girl gives a guy a blowjob whilst they are packing a fat lip (of chewing tobacco)
Guy 1: I got a Sloppy Dallas from Tiffany last night
Guy 2: Bro that's awesome.