The nickname given to the Potions master of Hogwarts, Severus Snape, by his childhood enemies, The Marauders (James Potter, Remus Lupin, Sirius Black, and Peter Pettigrew)
Sirius (to Snape): Shut up, Snivellus
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A very deadly disease, which causes the hair of the person infected to be greasy all the time. The infected person never washes their hair, and develops a hatred for shampoo.
'Hey, I noticed that guy has pretty greasy hair. It looks like he hasn't washed them in ages.'
'He must have caught the snivellus.'
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Severus Snape's childhood nickname.
Harry Potter reference
"Oi Snivellus! Where's Lily?" Shouted James
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