Definition of "Shrek"

[See title]

2009 January 9, Shaka Zulu, “Coolio should punch that ugly Shrek northerner woman in the nose”, in free.uk.tv.bigbrother‎ (Usenet)

'Well, well, well, who have we got here? 'A very fat Shrek suddenly loomed up on them. 'Your host at your service,' he said, with a little bow.

2012, Clodagh Murphy, Frisky Business

'I don't want my sister to see you look like a mess, like an ugly Shrek.'

2016, Jadyn Patrilita, Petimara Ualesi, Fear to Lose

How do you dry your hair? NO DIFFUSER? You are a Shrek. Diffusers are essential!

2017 May 27, Rekha Shankar, “A Few Simple Tips for Curly-hair Care”, in The New Yorker