1. utterly penniless; very poor; destitute; in want of money ...1886 sl.
2. dazed, absent-minded ...1934 sl.
from pebble + -beached
FIRST DOCUMENTED USE
1886 - see EXAMPLE below
"...We shall probably get enough of music hall tips to get thoroughly pebble-beached before the close of the season...."
From: Sporting Times