1. Refuse with contempt
   "She pooh-poohed his advances";
   - reject, spurn, freeze off [informal], scorn, disdain, turn down
    
2. Express contempt about
   "He pooh-poohed the idea of starting a new business"

Sounds like: p

Derived forms: pooh-poohs, pooh-poohing, pooh-poohed

Type of: decline, express, give tongue to, refuse, utter, verbalise [Brit], verbalize

Encyclopedia: Pooh-pooh