From kuwento + -ng- + barbero. The sense is possibly because of small talk by barbers, which may get mixed up because of conversations with multiple customers.
kuwentong-barbero (Baybayin spelling ᜃᜓᜏᜒᜈ᜔ᜆᜓᜅ᜔ᜊᜇ᜔ᜊᜒᜇᜓ)