This is looney tunes!

A woman who told cops her name is Tasmanian Devil was slashed across the neck inside her Manhattan building, police sources said Wednesday.

The victim, 29 — whose real name could not be immediately confirmed by The Post — was attacked in the East Harlem lobby on Second Avenue around 11:30 p.m. Tuesday, the sources said.

Her condition is unclear but she is expected to survive.

No one has been arrested.