To get (very) drunk
Also 'to go on the
lash'.
Synonymous with:
Get pissed, get
wasted, get hammered, get rat-arsed, get sloshed, get trolleyed etc
The word 'lash' orinally means to strike with a whip, and so has this extended meaning (ie. drinking makes you feel like you've been flogged).
NB. Usually used in a positive sense.
1. "Hey
John, what are you up to tonight? The
boys are all going out and getting lashed"
2. "The
boys are all going out on the lash tonight."