The afternoon timeframe beginning specifically at at noon trough the duration of the afternoon. Attention to the time is relative to noon vs anytime in the afternoon. Consideration of other times is acceptable, but should first acknowledge noon. "Noon-on" establishes a relative degree of protocol to planning time, beyond simply afternoon, early afternoon, or late afternoon. See examples below:
The process only takes a few hours, and we'd like to finish early, so lets begin noon-on. (The process can begin anytime in the afternoon, but relative to the "duration" and "end-early" desire, consideration should be given to noon, to early afternoon first).
The act of showing your frontal genitals to a person or persons. The opposite of mooning, by showing your rear end.
I went nooning last night and showed group of people outside a bar my penis.
Used to describe either an Antipodean chancer - someone who is full of BS when trying to sell a product or service - Or used to describe the act of screwing someone (e.g. a member of staff) over on the price of a product or service.
He nooningsed me yesterday, he told me it should be done for a low price, but he has no idea whats actually involved in providing the product or service. I've been fucked over. Or "He's such a noonings".