Definition of yum exclamation from the Oxford Advanced Learner's Dictionary

 

yum

 exclamation
exclamation
BrE BrE//jʌm//
 
; NAmE NAmE//jʌm//
 
(also yum-yum)(informal)
 
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used to show that you think something tastes or smells very nice More Like This Exclamations aargh, ah, aha, ahchoo, ahem, aw, bah, boo, coo, d’oh, eek, eh, er, eww, gee, ha, hey, ho ho, ho-hum, hooray, huh, mm, oh, oho, oi, ooh, oops, ouch, ow, oy, pah, phew, psst, sh, tsk tsk, tut, ugh, uh, uh-uh, uh-oh, um, whoopee, whoops, woo hoo, wow, yay, yippee, yuck, yumSee worksheet.
See the Oxford Advanced American Dictionary entry: yum