an acid trip is what happens when ur on acid. that whole period of time when u dont know what the fuck is happening, hallucinations, etc...

when you're hungover as shit after a spending a night drunk as a skunk

When you are walking and there is acid in the way and you trip

When you are dazed and just plane zoned out. You can becomed this way if you are either stoned or if you are confused or bored.