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Sexual intercourse during the lunch hour or afternoon hours.
After the afternooner I had, I am too tired this evening.
by nick_f May 12, 2010
Someone who generally starts their day in the afternoon, getting out of bed after 12pm.

It could be from late nights or just general laziness
Mike: It's 1.00, how are you not ready yet? You've had all morning.

Sarah: Well actually I went to a party last night so I only got up like half an hour ago.

Mike: Geez, whatever. You're such an afternooner.
by Mr Elevator February 28, 2011