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1.
Alternate way of spelling 'Cobber', Australian colloquial for mate, friend, good bloke.
G'day Cobba, been up to much lately?
by Snevet October 17, 2012
 
2.
A person of either gender who enjoys pleasuring one selves with a corn on the cob up the ass.
Joe-"My ass is sore from last night.'
Jack-"That explains what that corn cob was doing on your bed..You cobba."
by Baddy boy November 07, 2011
 
3.
a person who cant speak properly, usually mentally impaired in some way. they seem to congregate in groups and usually are extremely unattractive.
a cobba is usually drunk and has no life or aspirations in life, and will in most cases amount to nothing in life.
by jimmytjammy February 04, 2008