Or the finger of the hand not holding the pint?
I place under the pint glass for added support and to gauge the temperature of the drink.
IF YOU DON'T REALLY CARE
everytime you have a pint in your hand
You've witnessed that!
After performing a reconstruction with the pen pot on my desk I think I might do this when drinking whisky from a tumbler.
you have to GRIP your pint
seem to always do it subconsciously. It all started when I saw Super Ray in Bored to Death do it (which was meant to be ironic writing). If I catch myself doing it I stop.
it's an especially fun game for football fans on awaydays - find a home pub and proper camp it up... skip-jog to the bog, pinky out drinking, lots of winking. great memories doing this with my dad and brother.