When someone says something suspect implying they engage in/would like to engage in sexual relations with a family member.
Ex. 1
Guy 1: Dude my mom looks great in the shower.

Guy 2: Bro that's inSUSt

Ex. 2
Donald Trump: "I don't think Ivanka would do that inside the magazine although she does have a very nice figure. I've said if Ivanka weren't my daughter perhaps I'd be dating her."

America: Yo that's inSUSt
by Action POV Camera Guy August 29, 2020
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Tom Kenny's mix of the word Imposter, and sus!
Yooo hes acting a little like an insuster!
by Jaden Harrison Taylor July 4, 2021
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insuster (IN-SUS-TER) ; An adjective implying that an individual is (sus) or is suspected of being the imposter.
JAMES YOUR BEING A BIG INSUSTER TODAY
by Amongustermz October 2, 2021
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