Flap Lip is a term which is described to a 40+ year old male that is known to be weak/disrespectful towards a fellow Christian rapper known as Junius Rogers.
Known information about being a flap lip: Forty year olds stay tryin' to get in somethin' (Uh-huh)
Sit your old ass down before you slip or somethin' (what?)
Sit down 'fore you slip a fuckin' disc or somethin', huh (okay)
I'm a war pit (pit), young and ruthless (ruthless)
Sit your old ass down before you slip or somethin' (what?)
Sit down 'fore you slip a fuckin' disc or somethin', huh (okay)
I'm a war pit (pit), young and ruthless (ruthless)
by TAwaiN of Puffy Vaginas April 25, 2022
Get the Flap LIPmug. 
Get the Flapping Lipsmug. by Jake Demeter August 16, 2011
Get the lip-flappingmug.