Seriously hammered Crossword Clue

 The answer to the crossword clue "Seriously hammered" is BLITZED.

To be blitzed means to be very drunk. It is a slang term that is often used to describe someone who is so drunk that they are barely able to function.

Here are some other words that can be used to describe someone who is seriously hammered:

Drunk

Inebriated

Tipped

Wasted

Plastered

I hope this helps!