Attacking, slapstick-style

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Pi \Pi\, v. t. [imp. & p. p. Pied ; p. pr. & vb. n. Pieing .] (Print.) To put into a mixed and disordered condition, as type; to mix and disarrange the type of; as, to pi a form. [Written also pie .]

Wikipedia Word definitions in Wikipedia
Pieing is the act of throwing a pie at a person or people. This may be a simple practical joke , but can be a political action when the target is an authority figure, politician, or celebrity and can be used as a means of protesting against the target's ...

Wiktionary Word definitions in Wiktionary
n. An instance of throwing a pie at someone, most prominently a politician or other powerful or influential person as a means of protest. vb. (present participle of pie English)