plain nasty;
an utter raunch
eats babies
grody to the hella maxi-pads yo

loves queefing and pmsing all over ppls hair

The horrible moment when you realise that you have accidentally done something very slightly wrong which has very bad (usually embarassing) implications for you. This is typically the moment of realisation that you just sent a dirty text message to a close member of family, typically your mother, rather than the intended recipient.