yak
(n) This is actually the phonetical version of "gnac", as in "cognac". "Dre and snoop chronic'd out in the 'llac (caddilac), with Doc in the back sippin' on 'gnac" - Dr. Dre (The Next Episode)
yo
1) (n) You.
2) (n) Your.
3) (interj) To catch attention, as in "Yo! What's up?"

