If you are walking home, after a heavy
night drinking having been in the same pub from mid
afternoon until chuck out time at 11.20pm and you are completely unable to walk in a straight line and constantly veering into the centre of the road from the pavement, yet in the morning you have no hangover and remember getting home, then you are said to be waggered. Generally one of the most pleasant stages of drunken behaviour.
The word waggered comes from a mixture of stagger and
wasted.