A term used in Australia to define someone who is 'not quite there' in the head. Usually the typical person who is defined as such can be a little bit slow with some things in life or sometimes, for example, not catching on to what is otherwise something oblivious to the naked eye. Alternatively, it can be used for someone who is just having an off day and is stuffing everything up for everyone.
Example I:
Jack: *Starts licking windows*
The Boys: Gee, he really is not the full 100 today is he.
Example II:
Dale: Accidentally pukes everywhere whilst extremely intoxicated
The boys: Fuck, when this cunt is on the piss, he is not the full 100 exactly is he.
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