The name given to the last person online on your facebook online friends list, often late at night.
If the stiffott remains online because of a conversation via Facebook messenger that has ran over normal bedtimes and you are also his/her Stiffott it can be said that you are 'Stiffotting'.
Can also be used as a term for feeling uncomfortable ie 'i was at the party and I didnt know anyone, i felt like a total stiffott'.
"Laura is such a stiffott, I woke up in the night and she was still online, we were stiffotting till about 4 in the morning. who knows when a stiffott sleeps"?