Something/someone that's a pain in the arse or a ball ache.
'Ugh- Gary from IT is such a nair, he always forgets to replace the milk in the fridge after he's finished it'
'I hate taking out the rubbish in the evening, it's such a nair'
A skallion is a care-free soul that always puts a smile on your face. A skallion will light up a room with their loving personality and bright smile. Skallions are always extremely beautiful but can be very sexy at the best of times. People usually use skallion to mean the perfect girl or 'partner'.
Wow look at her, I bet she's a right skallion.