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1.
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
 
2.
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