People that start sentences with 'So, ...'
People (especially sports men & women during interviews, and some of the commentators) that put 'like' & 'you know' into every sentence - sometimes several times in each sentence...makes me want to slap them with a dictionary. For some reason it infuriates me even more when the person is well-spoken and presumably well-educated. I'm thankful for the mute button!
The misuse and overuse of 'basically' & 'obviously' randomly littering sentences
'High five' / 'give me five'
Any of the new, lazy, abbreviated or mish-mashed words - the first ones that spring to mind are 'delish', & 'merch'
I'm sure there are loads more but I have to get ready to go out.