Probably wordplay that doesn't translate well.
its not even wordplay. this is lit. from the raws. this guy just has super fucking cooked brain matter, it doesnt even sound close to "poltergeist" in japanese either. its completely ridiculous and makes no sense so we intentionally left it as is because this is way too funny to not do so
for ref
ホルモンバランス (horumonbaransu/hormonebalance)
ポルターガイスト (porutaagaisuto/poltergeist)
complete nonesense. i love saitou-sensei.