Wikia

Hurling Hex
Type	Hex
Effect	Unclear, possibly causes a broomstick to attempt to hurl its rider off.

"We've checked for most of the usual curses, but Professor Flitwick believes the broom might be carrying a Hurling Hex."

A Hurling Hex is a hex that can be applied to a broomstick. It presumably causes the broomstick to attempt to hurl its rider off.

History

In 1993, Filius Flitwick suggested that Harry Potter's confiscated Firebolt might have been jinxed with this spell.

In 1991, Quirinus Quirrell may have been casting wandless version of this spell on Harry Potter's broom during his first Quidditch match. However, it is stated that he was jinxing the broom, not hexing it.