An old played out meme which is overused by adolescents on several internet forums. It is an expression which is equivalent in stupidity to telling a Chuck Norris joke, and is often invoked after a person believes something another person has said or done is incredibly stupid and/or misguided.
Person #1: I hate hippies.
Person #2: *facepalm*
Person #1: I can seenow that you're a total douche. Bye.
The natural involuntary reaction of slapping your forehead with your palm in exasperation whenever Josh Payne makes a really a bad joke no one asked for, or laughed at, in a Slack Thread...again.
Anybody: (some bit of normal uninteresting casual conversation)
Josh Payne: "So many facepalms"
Another slack user reading the message: *facepalms self involuntarily, cringes, then leaves thread*
The Def. for facepalm is....... an act of idiocy that result in action as your hand completely pwn your face as you realize, you just fucked up. It's mostly common when playing Smash bros brawl.
Two people playing Smash Bros Brawl Guy1: *Dies*, FacePalm Fuck (*Release FacePalm*) I forgot i had a jump left! Girl1: AHH..HA, I PWNED you.
A textual expression of emotion from lack of forethought or oversight (to state without offense. Giving a little update for todayemoticon crazed ...'Minimalists'. :)