"Scanmarks"/"Cheating" -- WTF??

[esbesb]

Not sure where to post this, but since I was playing 2/4 NL on Party at the time, I'll post it here.

The hand is not important, but the guy put me to a big decision for all my chips. I let the clock run down to about two seconds before calling, then won a pretty big pot.

Next thing you know, the guys accuses me of cheating,saying I was looking for "scan marks." Then another couple of guys say, "Yeah, F the cheaters, let's go" and the table empties. I'm like, WTF? I mean, I've played several hundred thousand hands at Party and this is the first thing I've heard of scan marks.

Some sort of urban poker myth?