Boo vs. Foo

Boointerjection

A loud exclamation intended to scare someone, especially a child. Usually used when one has been hidden from the victim and then suddenly appeared unexpectedly.

Boointerjection

Used ironically in a situation where one had the opportunity to scare someone by speaking suddenly.

Boointerjection

An exclamation used by a member or many members of an audience, as at a stage play or sports game, to indicate derision or disapproval of what has just occurred.

Boonoun

A derisive shout made to indicate disapproval.

Boonoun

A close acquaintance or significant other.

Booverb

(intransitive) To shout extended boos derisively.

Booverb

(transitive) To shout extended boos at, as a form of derision.

Booverb

to show displeasure (after a performance or speech) by making a prolonged sound of "boo".

Boonoun

a cry or noise made to express displeasure or contempt

Booverb

show displeasure, as after a performance or speech

Foonoun

: an administrative subdivision of imperial China; the capital of such divisions.

Foonoun

(programming) A metasyntactic variable used to represent an unspecified entity. If part of a series of such entities, it is often the first in the series, and followed immediately by bar.

Foonoun

(fandom slang) gloss=placeholder god

Foonoun

(slang) fool

Foointerjection

Expression of disappointment or disgust.