Boo-hoo
'boo-hoo' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sob that I've seen before include "Snivel" , "Cry noisily" , "Weep heavily, wail" , "Cry bitterly" , "Weep noisily" .)
(Other definitions for sniff that I've seen before include "Slight suspicion (perceived though the nose?)" , "express one's displeasure" , "Snuffle" , "Chance" , "Inhale (glue); slight suspicion" .)