Definition of distros:
(n) :
(Internet, software, countable) A set of software components, often open source, that have been packaged into a larger product or component for distribution to end-users.
(n) :
An organization that distributes printed material such as magazines or newspapers.
(n) :
The act of distributing printed material such as magazines or newspapers.
(n) :
(Internet slang, uncountable) The propagation of warez by distributing it to various sites.
(n) :
(slang) A mid-level drug dealer; A distributor.