My Estonian friend told me they have an insult that basically means “excuse me but I think your mother still owes me money for the sex she had with my dog”. Bit longwinded for general use though.
Also, I really enjoyed a twitter description of Michael Gove during the latter stages of the EU referendum ‘debate’ which was him looking “like a haunted pork mannequin”.
Lastly, learning Welsh at the moment, I enjoy “tumfatt” which means fool.