I don't believe it's scriptural. Two passages
Acts 2:13 and
Ephesians 5:18 are the passages used to make the case. However,
Acts 2:13 says those that were mocking said the disciples were drunk. It wasn't an observation by those who were amazed at the fact that local Jews were speaking in languages from their countries of origin. The only evidence provided in
Acts 2 was that they spoke in tongues. No record of falling over, stumbling, passing out, slurred speech, uncontrollable laughter.
Ephesians simply says don't be drunk with wine but be full of the Spirit. It doesn't say "be drunk with the Spirit". It isn't saying there is a parallel between being drunk with wine and being full of the Spirit.
If there is a physical drunkenness/spiritual drunkenness parallel, why don't we see people throwing up in the Spirit, getting in fistfights in the Spirit, having hangovers in the Spirit, getting in auto accidents in the Spirit, etc?
I'm not convinced there is strong scripture to make a solid case for "drunk in the Spirit". What I've witnessed in my lifetime never gave me a sense that what I was observing was bringing glory to God. Call me backslidden, a skeptic, or cynical, but I say its unbiblical.
Go to YouTube and watch videos of people drunk in the Spirit or of holy laughter or anything of the sort and you'll be convinced that this is a work of the flesh.