To give the hottest, wettest head. Period.
Dude #1: Man, Lauryn gives that fire mouth.

Dude #2: is that why you re walking so wobbly?

Dude #2: Yes sir, she sucked the life outta me, near about. I may need to go home and take a nap.
by MollyHopsin September 10, 2014
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A fire mouth is a person who is always eating hot foods,spices, or salty foods.
Kasper is always eating somethong hot, hes such a fire mouth!”
by Dickmonger2000 June 11, 2021
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