Choke on joke (3)
I believe the answer is:
gag
I believe this is a double definition.
'choke on' is the first definition.
(thesaurus)
'joke' is the second definition.
(a gag is a joke or witticism)
(Other definitions for gag that I've seen before include "Censor" , "Part of stand-up routine" , "Muzzle in palindrome form" , "Humorous anecdote or remark" , "Palindromic muxxle" .)