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!
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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"
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