Tffff is a quick reply method to agree with someone, to let someone
know that you
understand what they're
talking about, or to finish their thought.
It's similar to "I know what you're saying".
Sentence: "I'm freakin starvin'".
Reply: "Tfff" (could mean,
I'm hungry too, or I know because you haven't had a thing to eat all day)
Performed by lifting the
upper lip and sucking your
bottom lip through your front two teeth.