“Peskipiksi Pesternomi! ...Well, I’ll ask you three to just nip the rest of them back into their cage.”
-- Professor Lockhart to Hermione, Harry and Ron (CS6)
Lockhart’s version of a Freezing Charm.
References from the canon
- Lockhart tried this spell on the escaped Cornish Pixies. It had no effect. The spell words certainly don't fit the usual format, so it seems likely that Lockhart was making the whole thing up on the spot (CS6).
"pesky" + "pixie" + "pester" + "no" + "me"