The act of one's chair unexpectedly shooting from beneath them resulting in their ass hitting the floor.
I can't believe I just pulled a FatJake.
Ha Ha, Tiesha just pulled a FatJake.
Don't talk shit to me; I'll make you pull a FatJake.
Wow, that FatJake was really refreshing; Just what I needed to wake me up!
She pulled a FatJake in front of the humungous auditorium full of her colleagues.
I broke my backbone from pulling a FatJake.
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."