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Open Air Pub. Taking place on the lower field at McGill University at the beginning of each semester.
"Man, we spent, like, all afternoon at OAP. Then we went to Poli 227 totally trashed."
OAP by claire February 3, 2005
Old Age Pensioner, Someone regularly seen using a 'zimmer frame' and carrying a colostomy bag. Possibly has an problem with an overactive thyroid gland.
Person 1: My Gran is going down the post office to get her pension
Person 2: Becuase shes an OAP.. Duh!! Fassyhole ._.
OAP by Ferd January 3, 2005
1. An acronym for One Act Play.

2. A UIL competition in which a play with only one act is performed.
I made allstar cast in OAP!
OAP by itsjustluck March 27, 2004
an oap is an old ass person
damn look at that oap. he's older than my grandma
oap by smulls September 4, 2006
Over Affectionate Parents.
You walk into the room, and your beloved parents are going at it asif they're 40 year old amateur soft-porn stars.
It's enough to make any innocent teenager feel physically sick.
Olivia: 'I walked into the room today and my parents were totally making out and aahhh they make me sick! They're fucking OAP's.'
OAP by opn94 June 23, 2009
'give my my ball back mister'
'no!!'
'FUKIN OAP's'
OAP by hawkstain July 29, 2006