Definition of rando:
(adj) :
(colloquial) Random; arbitrary.
(n) :
(colloquial, mildly derogatory) An arbitrary person with whom one has no shared social connection.
(n) :
(colloquial, mildly derogatory) A person going to a party without being invited.
(n) :
(colloquial) Anything selected at random.
(adj) :
Pertaining to randonnée or uphill skiing.