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1.
"haha yeah" is used when one person cant think of a decent way to respond a text message or just doesn't care about talking to the original texter.
haha yeah
by johneyamerica May 31, 2010
 
2.
Usually used when you are left out of a group and you hear that group laughing then you come over and you say Haha...Yeah. Results in a disgusted stare.
*Group Laughing*
Jafar: *Comes Over*

Haha...Yeah
Someone from group: *Disgusted Stare*
*Group Goes Away*
by Hi How Are You? October 27, 2010