When your wife is sleeping hard and needs to wake up, so you go in for a quickie to jump start her day while attempting to climax right as she wakes up
I'll be a little late to work today, need to take care of a deadbattery
Someone who does not believe in regular bathing, or, a person whose body odor develops before they can bathe again. Also a good insult for somebody you dislike that is in either of the former categories above.
Hey, look! It's the Ignorant Dude who Smells Like He Took a Bath in Dead Fetus Juice!