A nerd, one who sits at home and plays Halo all day. A Cosma masterbates to Halo characters.
The "Cosma" is jackin' it.
by ELHS24 September 30, 2006
Top Definition
a saint from the early Catholic church; twin brother of St. Damian

patron saint of pharmacists

performed medical services for no charge and also performed miracles

martyred for the Christian faith
"We pray for the intercession of St. Cosmas as these pharmacists enter the profession," the professor remarked at graduation.
by Confirmation Cosmas March 14, 2009
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