Sob when boot and hood are detailed (3-3)

'sob' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'boot and hood are detailed' is the wordplay.
'boot' becomes 'boo' (I am not sure about this - if you are sure you should believe this answer much more).
'and' says to put letters next to each other.
'are detailed' means to remove the last letter (the word must be end-less or 'de-tailed').
'hood' with its final letter taken away is 'hoo'.
'boo'+'hoo'='BOO-HOO'

'when' is the link.

Can you help me to learn more?