In a video game, to gather information on an area hidden in fog of war by charging in. To check for enemies with your face. Seems to have originated in League of Legends where vision-obscuring bushes allow champions to wait hidden from view in very close proximity to their opponents.
I told Annie not to facecheck the brush, but she did anyway. Garen scored first blood.
Grandma - I finally got a facebucket! Now I can add you and send you virtual birthday gifts and invites to stupid groups to annoy the crap out of you. YAY!
Me -....yay?
When someone leaves their Facebook account logged in or shares their login details with someone else at which point someone makes posts to said person's account without their knowledge.
"Bill just got facejacked. That guy gave me his login credentials for Facebook so I wrote on his wall and updated his status."