In the sea of possible abbreviations for McDonald's, this is clearly the best one.
D: So, I was wondering and all, what d'you guys wanna do for lunch?
M: I'm thinkin McD's?
D: Nice one!
Essentially, to porkpie someone is to ignore them (if intentional) or to simply not notice them.
The etymology of "porkpie" is as follows: In a weak attempt at improvised cockney rhyming slang, "porkpied" was used in place of "denied". That's it really. It sort of rhymes with denied.
Can be used as an interjection, a noun, a verb.. even a way of life, if you're so inclined - making porkpie a valuable addition to anyone's vocabulary.
Can be abbreviated to 'pied.
More experienced users of the word have been known to say it with an accompanying gesture - any formation of the hands, which alludes to the view through a cross-section of a porkpie, will do. A plan view of such a porkpie is generally unacceptable, however, and can even be interpreted as an insult in some circles.
J: Hey mate, how's it goin?
M:
J: Porkpied!
M: Was I porkpieing you?
J: You totally 'pied me, you
bummer
M: OK OK, no need to get
eggy
The process whereby one's own plans are shunted aside to make way for what someone else wants to do. The offender's act(s) can often go unnoticed, and "snowploughed" can be uttered (most commonly as an interjection) to make them (and anyone else around who will listen) realise just how appalling their selfishness really is.
M: So you guys want to go to
McD's?
All: Yeah, why not
(Enter S)
S: Let's all go somewhere completely different for lunch today!
All: Yeah, why not
M: *sigh* .. snowploughed