@XzarDragon
The line is 「バカになれデンノコ」, "baka ni nare den'noko", which is "become an idiot, electric saw".
Incidentally, Denji's name is written in katakana similarly 「デンジ」 and is homophonous with "electric".
Maybe she just combines his half-remembered name with his current appearance to get that...