The "Bentora" thing is a reference to classic anime Urusei Yatsura, and it's a chant that the self-proclaimed Lum Stormtroopers do in the second episode (they do it in at least one of the movies too) in hopes of calling her back from her home planet, where she'd gone to fill out transfer paperwork to live on Earth.
The original manga translation went with "Bentora", but it's possible they were actually saying "Ventura", which at least kind of sounds like an actual word. The "Space People" part of the original chant was said in English.
EDIT: Ah, found the actual scene:
https://youtu.be/T82cfApNUDk?t=928
last edited at Jun 19, 2019 10:41AM