Our lingo is outrageously disgraceful (10)
I believe the answer is:
inglorious
'disgraceful' is the definition.
(I know that disgraceful can be written as inglorious)
'our lingo is outrageously' is the wordplay.
'outrageously' indicates an anagram.
'our'+'lingo'+'is'='ourlingois'
'ourlingois' is an anagram of 'INGLORIOUS'.
(Other definitions for inglorious that I've seen before include "Causing ignominy" , "Not noble" , "description of Milton possibly in Stoke Poges" , "Shameful" .)