TANGA
 
 
 
stupid, idiotic, gullible
Tanga!
Idiot! 
Ang tanga mo.
You're so stupid.
Ang tatanga nila.
They're such fools.
Mga tanga sila.
They're fools.
Araw ng mga Tanga sa unang araw ng Abril.
It's the Day of Fools on the first day of April.
A milder form is tangí (tange).
Mansanas ito, tangi!
This is an apple, idiot.
katangahan
stupidity 
nakatanga
doing nothing 
(with mouths just hanging open like idiots)
 
                                          There's also an obscure definition for the word 
tanga.
                                                                   It can mean 'moth.'