Eating so much sodium-laden fast food late at night that you don't recognize yourself in the mirror the next morning.
"Damn. Did you see old gal today? Her face was so blown up I couldn't even recognize her. She must have Super Sized at McDonald's last night."

"Help. Someone. Let me out of here. I am stuck inside this face prison and I can't get out!"
by Alfsonso March 18, 2010
Get the Face Prison mug.
Resting Prison Face is the phenomena of someone making a particularly menacing or unapproachable face when outside, at all times. Also see resting bitch face for a similar effect.
Friend: "What's with your face bro are you angry or something"

Friend 2: "that's just my RPF (resting prison face)"

Friend: "oh, RPF bro, I get it
by BilliamShagspeare January 30, 2021
Get the RPF (Resting Prison Face) mug.