irishslang.info
diahorrea
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I would like to perform oral sex on you

irishslang.info
Mentally competent - e.g. "He's not the full shilling"
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Your DA,

Your Father, 

See also “Your MA”

How to win any slaging match,

eg, One person says to another, F**K you've a big head,

Second person response " i your DA likes a big head"

Head in this case being a sexual innuendo, referring to the male penis.
irishslang.info
said when you have just let of a smelly fart
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To engage in meaningless sexual intercourse.

 "Are ye away out thenight to get yer hole?!"

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A woman with a particularly sloppy Vagina

"Hi Fellas, the cocktrough on that thing was like ploughing a field with a pencil."

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A way to describe someone with buck teeth
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(pronounced "Bust Yer Cran-Yum")

To hit someone violently over the head.

 "See if you don't leave me alone, I'll bust yer cranium!"