the state of feeling the effects of alcohol long after you have sobered up -- the purpose behind this is that sobering up, after a particularly heavy night of drinking, takes a lot out of the body, and creates something akin to a tired high -- this state is known as being redrunk.

After you've stopped drinking for a bit and sober up, you drink more until your hammered again

to drink and get hammered, then sober up. then start drinking again and get drunk all over again, all in the same night.

Drunk as a result of drinking alcohol to get rid of a hangover

Going too far while trying to kill your hangover with some counter alcohol, resulting in another nice buzz.