It means 'speak to you after' in a daft Irish dialect. Similar to 'Cockney Rhyming Slang', they say words that kinda rhyme, but make no sense/are impossible to work out.
...Funny though! For more great sayings consult your local Irish friend...
Michelle: k im really bowing out this time mateso...hugs and kisses. Pat rafter :D x

Ash: What the hell?! Speak English you silly Irish pikey!
by The Real Johnny Doe January 8, 2010
Get the Pat Rafter mug.
Taken after the famous tennis player for reasons unknown, Pat Raftered comes form the term "Packed to the Rafters", meaning there is a lot of congestion in one specific area.
Can be used to describe any incidence where there is congestion e.g. "The Bus was Pat Raftered today"
by LanceSmith August 29, 2008
Get the Pat Raftered mug.