I'm not entirely sure.
It might be for puns, or other particularly sour jokes.
It might mean someone has won a prize.
(
Syncubus Yarr! Ye'll be walking Planck's Constant! [GMT-5],
Sun 26 Dec 2004, 3:31,
archived)
*bangs gong*
Look out! Here comes a beefy one!
(
Syncubus Yarr! Ye'll be walking Planck's Constant! [GMT-5],
Sun 26 Dec 2004, 3:37,
archived)