I write. I speak. I read. Words occur a lot in all three of these activities. These are some of my favourites. Gripping.
infallible - I love how this rolls off my tongue, and it rolls off it a lot. It pops up all the time when I'm arguing with myself, aloud. Right.
absolutely - I rarely use this as a synonym for 'totally' or 'completely,' mainly to agree. It's more interesting than saying 'yes' or 'yeah' or 'uhuh' or 'affirmative.' It adds a little bit personality to agreement, if you get what I mean.
cracking - Similar to 'absolutely,' I prefer using this than simply saying 'great,' 'good,' 'excellent' or 'okay.'
meat - I love this because it's vague and specific depending on its usage. Meat pie and meatloaf, fine. 'Is this a meat dish?' Cool. But see a can of Iceland's 'meat curry' and you start to wonder exactly what the hell 'meat' refers to.
facetious - I rarely use this word other than in lists of my favourite words. It's not particularly fun to say, but it has all five vowels in alphabetical order. Whoa.