1) Affirmative answer 2) Beatles chorus word 3) Beatles refrain 4) Beatles refrain word 5) Bit of a Beatles refrain 6) Casual agreement 7) Casual assent 8) Casual consent 9) Colloquial affirmative 10) Colloquial assent 11) Concert scream 12) Encouraging word 13) Fab Four word 14) Fist-pump cry 15) For sure 1) I guess 2) Oh really 3) Uhhuh 4) Yeh 
[DJ Krush song]