Are you always late?
Give yourself a much larger arrival time frame by suffixing all meeting times with "ish". ie 'see you at 6'ish'. By doing this you can be at least another 45 mins late without the person you are meeting having any grounds for being pissed.
(The Archduke of South London I'm in your Girlfriend eating her organs, Wed 21 Jul 2010, 23:52, 3 replies, latest was 15 years ago)

That gives them plenty of grounds for being pissed
because they've been in the pub for 45 minutes before you turn up.
( K2k6 has a proper job these days, Thu 22 Jul 2010, 12:38, Reply)

me and a few mates
use the term 'owa'
"I'll be there in an owa" which could mean anything between 45 mins and a fortnight.
Less than an owa is 'sune' and 'farvminits'
( sandettie light vessel automatic New Twitter - @bollocksreally, Thu 22 Jul 2010, 14:58, Reply)

this is also likely to give someone the opportunity to use a quality joke
them: "what time shall we have the meeting?"
you: "tennish"
them: "but I haven't got my racquet!"
( Vipros. clever got me this far, then tricky got me in, Fri 23 Jul 2010, 10:41, Reply)