Dedicar una peineta

[poli]

I'm nearly positive it means to give someone the finger. It sounds like it is unique to Spain. Is the term used in other countries?

[Rusty]

'hacer una/la peineta' = 'dedicar una peineta'

'give someone the finger'

[asensiofj]

El gesto de la peineta ya se hacía en tiempos del imperio Romano.

The peineta was already used in Roman Empires age.