1.) To slide a layer of yucky saliva on something. To taste something. 2.) A trace of something. 3.) A treasure, prize or money of some sort, as in, you caught a lick. In the world of pirates, it's a booty. When you come up on unexpected money. 4.) A lick is musical idea, but often it's incomplete. It might be a fragment of a solo or a portion of a riff. By itself, it doesn't usually become thematic---in fact, a lick that forms a theme essentially becomes a riff. A lick combines with other licks to form a complete musical idea. Because a lick isn't the main theme, it doesn't have that same association with the song, and so it's transferable: it can be used in other songs without necessarily having to allude to the original.
"Black Dog" by Led Zeppelin also uses a great lick as its main riff. They play it in different keys, but it's still recognizably the same idea. You could imagine that melodic fragment as part of a solo, but by using it as the foundation of the song, Led Zeppelin makes it a riff. I could see someone playing this at the end of their solo, and I'd think it was both clever and funny.Source: Music Stackexchange 5.) Cunnilingus. 2.) bissel, bit, bite, bupkis, crumb, dab, dollop, driblet, drop, droplet, dose, fleck, itsy bitsy, itty bitty, jot, lick, little bit, ein bisschen, grain, hint, microscopic, mini, miniscule, nip, nub, particle, pinch, scrap, shred, skosh, slight, sliver, small, smidgen, speck, splash, sprinkle, swallow, tad, tad bit, taste, teenichy, teensy, tid bit, tinch, touch, trace, un paquito, wee