(adverbial particle, dismissive, derogatory) emphasizes disgust, contempt, or otherwise negative feelings of the speaker: whatever

a fountainhead (source of a river) / a source, origin

information / news / gossip

What? What did you say?

a surname, especially those who are descendants of Emperor Saga

a source, origin

fountainhead / source, origin / Short for 源氏 (Genji): Minamoto clan

source / origin / root

whatchamacallit, X

what