A mixture of sweat, dingleberries, baby powder, loose pubes, urine, and dirt that collects in the chode of a soldier after they've been in the field without a shower for more than a couple days. It can be scraped off with a fingernail, mixed with water and rubbed on the face and arms for insect repelent.
Matt, "I order you to take a shower when we get back to base. You fuckin' stink!"
Jeff, "I know. I'm churnin' some serious duck butter!"
An uncontrollable spontaneous utterance said when a grotesquely ugly female (see boogawolf) walks by. It can be accompanied by douche chills, fever, profuse sweating, nausea, and projectile vommitting.
When a person is so obese that their cankles bow outwards. In moderate cases the outside heel of the shoe becomes excessively more worn than the inside heel. In extreme cases the fibula touches the ground.
Jeff, "Hillary Clinton is so fat and grotesque. I think she was born a man."
Matt, "Yeah I was at her political rally last week and she had the worst case of bowcankles I've ever seen."