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8.
An annoying person. Usually indicates presumption, arrogance, grandiosity.
That hairball accosted me again, as if I could could care about his latest urgent need.
by Mudge9 July 04, 2009
 
9.
A common prison sex practice, where one inmate inserts his penis into the other inmate's often unshaved armpit. The term comes from the contact of the testicles to the armpit hair.
Prison Mike: C'mere, boy, lemme hair ball you.
by Puddingcup4110 October 18, 2009
 
10.
see furball
ugh I gat a hairball in my throat.
by Chickenman June 12, 2003
 
11.
adj. Anything thrillingly dangerous situation which evokes the feeling of needing to toss your cookies.
Man, that downhill run was hairball.
by Carole P November 11, 2007