为什么冷笑话在香港叫做“烂gag”有谁知道由来？

juara

刚看完了港剧“家好月圆”，发现到香港人习惯把烂笑话说成“烂gag”，gag在英文的意识是禁止发言，他的意思是这笑话冷得让人无法发言吗？而且这句话的由来不是最近才发明的，而是沿用了很久的，那请问有谁知道这个字的由来吗？

战神蚩尤

那为什么“烂gag”在台湾叫做“冷笑话”？

juara

gag      /gæg/ Pronunciation Key - Show Spelled Pronunciation[gag] Pronunciation Key - Show IPA Pronunciation noun, verb, gagged, gag·ging. Informal.
–noun 1. a joke, esp. one introduced into a script or an actor's part.  
2. any contrived piece of wordplay or horseplay.  
–verb (used without object) 3. to tell jokes or make amusing remarks.  
4. to introduce gags in acting.  
5. to play on another's credulity, as by telling false stories.  
–verb (used with object) 6. to introduce usually comic interpolations into (a script, an actor's part, or the like) (usually fol. by up).