Riled means stirred into irritation. Get riled, riled up, don't let it rile you.
It is informal and always about being provoked by somebody rather than annoyed by circumstance, which is the useful distinction. Riled up is the American form and is stronger. The verb rile is a variant of roil, meaning to stir up muddy water.
1adjectiveriledStirred into irritation.
“He gets riled whenever anyone criticises his driving.”
riled is a state.
rile comes from a dialectal pronunciation of roil.
Etymology from Wiktionary, CC BY-SA