A general feeling of guidance to do a certain thing, followed by a full-body feeling of euphoria when doing that thing. Sometimes accompanied by "coincidental" positive interactions surrounding that thing.

Ephesians 5:18 instructs us to "not get drunk on wine, which leads to debauchery. Instead, be filled with the Spirit". And it is indeed accurate that the feeling is a higher high than wine or weed will take you. I suppose molly or heroin might be superior but I have no experience with those. And there's something psychologically nice about feeling good because you are doing the God-ordained right-thing, versus simply hijacking chemical receptors. And the Holy Spirit has no "come-down", which is nice.