A phrase describing a changed or altered circumstance.
Can also be used in a positive connotation.
"My buddy tripped out hard on mushrooms last night. He was messed up. The whole night was switched."
"Yo! Did you see those hot as hell girls who showed up to the party? That was fucking switched!"
"I thought we were supposed to meet at this bar last night. Man we were all wasted, the whole night was switched."