We call it <i>feeling maayo</i>. It means someone who feels he/she is good at something but he/she really isn't. 

Or <i>feeling brayt</i>, from English <i>feeling</i> + <i>bright</i>, someone who thinks he/she is smart. 


In the same structure:

* <i>feeling gwapa</i> - thinks she's pretty but really not. 
* <i>feeling dato</i> - social climber