！？！！
What?! You can't?! You've got no guts! Wimp!!
Literal
What [よ]! Can't-do [question-の]? This courage-less! Hip-puller-[っ]!
A cascade of insults. 度胸なし is a compound insult: 度胸 ('courage, nerve, guts') + なし ('without'), 'gutless.' 腰抜け ('hip-puller,' i.e. someone whose hips give out from fear) is the standard Japanese word for 'coward,' with the vivid physical image of being unable to stand up straight. The final small ッ in katakana emphasizes the shout. なによ is a feminine exclamation, and 出来ないの is the の-question form seeking confirmation with an accusing edge.