The left-over cum residue in the beard of a person who has recently engaged in oral sex
Big Bear: "That's a 10-4 on the 319 and I...what the?"
Falcon: "Is thar a problem Big Bear?"
Big Bear: "Oh it's nuthin. I just din got some semen on my chin. Probably on a count of that sloppy sesh I had last night"
Falcon: "Aaaw Cumbeard! That's nasty! Now why'd ya hafta go and tell me a thang like that!"