Well, according to Urban Dictionary, a “Poke Off” is:

When two people (usually elderly) take up both lanes of a highway and drive a the speed limit or sometimes slower, causing everyone else to be pissed off.

I don’t buy it though. There were only three votes, all positive. I voted it down and suggest you do the same!

On a 500+ member strong Facebook page titled The Official Facebook Poke Rules, “Poke Off” is defined as:

1/. A poke off does not need to be declared between interested parties . The initial poke is sufficient to instigate the poke off.
2/. Once a poke off has started the pokee must poke the poker within four days of logging on to Facebook.
3/. The winner is the poker who pokes last, as long as the previous rules have been stuck to, and the pokee fails to poke the poker back according to rule 2/.
4/. The poke off winner should humiliate the loser in an appropiate manner. “LOSER” in a wall post will suffice as a bare minimum.
5/. Physical poking, in all of its forms, counts.

Most people in the United States call this activity a Poke War (probably because war is sort of chic here). It’s the same thing. People just poke back and forth, either rapidly or sporadically, over a short or extended time period.