The symbol itself, redesigned in a Maori fashion, is an Ashanti symbol called "Ese ne tekrema" which means "the teeth and the tongue", and just like both teeth and tongue are necessary to talk and eat, the same way two friends can be very close.
The two Fs have been derived from theinner motif. The original version can be seen here.
Available without F letters too:
Adinkra traditional designRelated tattoos:

Unity

Maker of songs

Seashell

Brotehrhood

Symbols

Beauty, femininity

War horn

Except for God

Interdipendence

God´s presence and protection

Guardianship