Personal Digital Assistant, a small pocket size computer that usually runs calenders, phonebook, games etc. these days they even work as mobile phones, see smartphone. smaller than a laptop, bigger a mobile phone... often used with a "pen" or a mini-keyboard
i got a cool new phonebook for my PDA.
by deice May 27, 2003
public displays of affection... aka getting on each other in front of other people
girl #1: wow that couple is having some major p.d.a over there
girl #2: yeah there going at it... even in public
by christine holt October 18, 2005
Originating from the mouths of people who are upset with their friends who are grossly making out. This terms applies to couples who french kiss and touch each other inappropriatly in front of friends, family or other public persons.
God! There they go again with the PDA. So gross!
by Team Strike January 09, 2005
public display of affection
Girl: PDA alert! Stay away if you dont want to be scared for life
Couple: Pfft, more action then youve ever gotten so fuck off.
by Jacie July 25, 2006
a public display of affection between a couple, especially one that is considered inappropriate in a particular place.
Lay off the pda you two.
by The Return of Light Joker July 20, 2009
Pull Directly from Ass
When estimating dates for a project, a wild guess, usually inaccurate.

PM: “Where did you get those dates on the status report?”
Engineer: “I PDA’d them, don’t trust them at all.”
by Random PM April 10, 2007
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