An informal address among friends in Mexican Spanish that signals familiarity and comfort, ranging from affectionate to frustrated depending on tone.

French youth transformed "serious" into an intensifier meaning really or very — pure emphasis that marks you as inside contemporary spoken French.

Colombian street slang "parcero" became "parce" - the ultimate casual friend address that turns every conversation into an easygoing chat between equals.

Aggressive Bay Area hip-hop and the wild, uninhibited behavior tied to it—where the music's energy demands you abandon all restraint.

A single syllable Chileans add to everything — so automatic they don't notice using it, so distinctive that everyone else does.

A Roman exclamation that shifts from casual acknowledgment to passionate rallying cry depending entirely on how you say it.