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A person who laughs unnaturally often.
bahaha look what a sharni
by britneys boy May 20, 2008
Someone who laughs when its not funny.
Shaz:: Nobody laughs at my jokes *Makes sad face*
Alfie:: Thats because they're not funny
Ash:: Thank god we have a Sharni in our group
Sharni:: *Laughs uncontrollably*
by BrookeHale September 17, 2008
A girl who goes from mega sassy to cute and adorable
sharni: guuurl! your face is so ugs

next minute*
sharni: your beautiful dont let anyone tell you your not!
by lukebrooksofficial February 23, 2013