► 名詞ナニ  [(2)なに]  [coll]    
meaning:  penis  rank: 4☆ あいつはナニが
デカい ⇨ He’s got a big you-know-what  
(☛ Note the difference of stress with 何)ナニ  [(2)なに]  [coll]  [euphemism]  [男]    
meaning:  sex  rank: 4☆ 
昨晩女房とナニをした ⇨ I did the deed with my wife last night  
(☛ Note the difference of stress with 何)