yeah 
/ˈjɛə/ adverb
/ˈjɛə/ adverb informal 1 : yes
▪ “Are you coming with us?” “Yeah, I'm coming.” ▪ Yeah, I agree with you. ▪ “That looks good.” “Yeah, I think so too.” 2 — used in speech to show that you are surprised by or disagree with what someone has said ▪ “I'm from Maine.” “Oh yeah? [=really?] I didn't know that.” ▪ “I'm a better runner than you.” “Oh, yeah? You think you can beat me?” ▪ “You're a lousy golfer.” “Oh yeah? I'd like to see you do better.” 3 — used in speech to express disbelief ▪ “I met a famous actor yesterday.” “Yeah, right/sure.” [=I do not believe you]
▪ “Are you coming with us?” “Yeah, I'm coming.” ▪ Yeah, I agree with you. ▪ “That looks good.” “Yeah, I think so too.”
