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1.
a. To be so blacked out drunk one evening and not be able to distinguish dreaming and drunken reality on the subsequent morning.
Vaughn: "Dude, Tyler What did you do last night?"

Tyler: "I got fucked up last night but I don't remember the second half of the night."

Vaughn: "Yeah you're definitely in inception mode today man."
by Brook's Brother July 23, 2010
 
2.
when you get so high you can't tell what's real from what is fake and every simple question seems puzzling and trying to answer seems to take you deeper into your subconscious
Christian: What time does the narwhal bacon?
Constance:That question is making me enter inception mode
by independentyouth April 17, 2012