On dating and hookup apps,
flagging proves you are your profile picture. If someone wants you to 'flag,' they tell you to write something totally random on a piece of paper. You
write it down and then take a selfie while holding the piece of paper (include your face/body/whatever is visible in the
profile pic). If profile and 'flag' pic match, you get to proceed to shenanigans. If they do not match, then you're a fake and should really find another hobby.
Hot damn dude, you have the hottest
8-pack on
Grindr and I want to lick you like my dog licks peanut butter!! But you sound kinda fake. Flag "Abs 4 U" so I know you're real. While you're doing that, I'll go grab a jar of
Skippy...