(rhetorical question, sarcastic) Used in response to someone’s threat suggesting that the person in question cannot do what she or he says alone.

(archaic) whosoever, whatever person

(possessive) Of whomever; belonging or related to whatever person or persons; whoever's.

(possessive) That of whomever; that which belongs or is related to whatever person or persons; whoever's.

(proscribed) whoever is.

Of whomsoever.

That of whomsoever.

Rare spelling of whosever.

(colloquial) A thing (used in a vague way to refer to something whose name one cannot recall or is embarrassed to say)

plural of whosit