A sloppy dallas is when an individual receives a blowjob from someone with a mouthful of tobacco dip and is left with dip residue on their penis after said blowjob.
I gave Rebecca the last of my dip and she used it to give me a sloppydallas
A blowjob with a mouthful of dip. Dip goes all over shaft of penis and makes large mess. Large enough to get on your shirt. (created by Mcnasty, TheDooo, Soup, Blarg,)