Acronym: Head Down Mother Fucker! Typically used to indicate that either oneself or the recipient should put their head down and do some work.
Worker1: So worker2 how was your weekend?
Worker2: Good thanks. You?
Worker1: Oh fine. Hows the kids?
Worker2: Yeah pretty go-
Boss: Head Down Mother Fucker!
1. To over-think to the point of confusion 2. To have thoughts of random things circle in your head 3. to have someone have sex with your face, and or eye sockets
"Ive been thinking about this whole thing to much and im just head fucking myself."
Or "Some guy head fucked me last night and I have sore eyes".