Top definition
1.Person who is self-obsessed and a big douche...penistwats often have livejournals.
2.A cross between a penis and a twat.
'I'm such a penistwat, I just can't stop updating my livejournal'

'Oh balls! I have a penistwat! what am I?'
by Schmaz March 14, 2005
Get the mug
Get a penistwat mug for your buddy Larisa.