► 名詞必殺  [ひっさつ]    
meaning:  kill  rank: 2☆ 
彼の必殺
パンチが
決まった ⇨ His kill punch landed squarely  
(☛ Literally “sure to kill”.)必殺  [ひっさつ]  [humorous]    
meaning:  special  rank: 2☆ 
オヤジの必殺
ギャグ ⇨ Dad’s special killer joke
More examples:- 彼は必殺技を使って相手を倒した ⇨ He defeated the enemy by using his special, signature, move
 - 彼女の男を落とす必殺技 ⇨ Her killer technique to get the man she wants