The effect of THC on the neck muscles offing only two comfortable and easily held positions of the head: thrown back (like if you were standing and staring up at the sky) or limp (like resting your chin on your chest to nap).
PS: You may not understand if you aren't high.
"You wanna do some head hingin', I got a dub sack?"
Phrase used to describe a set of boobs so unattractive that they look like a pair of socks hanging from a clothesline. Hanging sock tits are mostly fat with little breast tissue. The complete opposite of a nice set of tits.
Brenda looks like she has hanging sock tits in that bikinitop. Be prepared to vomit if you look at her.