IPA: //huːˈmɛvər//
KK: /huˈmɛvər/
This word is used to refer to any person or people, especially in a way that emphasizes their identity or role in a situation.
You can invite whomever you like to the party.
Whomever is formed from "who" (from Old English "hwā", meaning a person) and the suffix "-ever" (meaning at any time or in any case). The word "whomever" refers to any person who is the object of a verb or preposition, emphasizing inclusivity in the choice of person.
Think of 'who' as referring to a person and '-ever' as meaning any time or case — this helps you remember that 'whomever' refers to any person in a given context.