A flange warmer is a persons butt crack. It is spread wide to accommodate a mans penis to keep it warm in bed during the winter months. It is more effective if the butt cheeks are gently clenched to retain heat.
I had such a cold cock last night I couldn't wait to get into bed and get my boyfriend to give me a flange warmer.
by pipesucker February 26, 2018
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Expressing interest a Pokemon Go event well after the event is over.
Chaz: Who wants to do a raid in 20 minutes?

Paolo: I'm in!

Joe: Me too!

*6 hours later...*

Flangeline: I'll do it!

Chaz: Typical. Pulled a Flange again.
by JRSOne October 29, 2021
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The area of loose skin under a cat between the back legs and the torso.
Mittens has an exceptionally large cat flange.
by MangoCat March 10, 2017
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Make something definite and specific, nail down.
We need to flange down the details of our trip.
by MikeIsCliff December 21, 2017
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When a lady is not wearing anything below the waist.
Did you see that girls daisy duck cosplay? she was free flanging all over the place!
by LeCoq1979 April 8, 2022
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