naggery
Naggery is when someone acts like they're the only person who matters and won't stop talking about how great they are. It's like being stuck with a loudmouth self-centered idiot.
My dad does naggery every night. 'I'm the best dad!' 'I'm the best boss!' I'm gonna say I'm not the best son.
My friend does naggery in class. 'I'm the smartest person!' 'I have the most friends!' I'm gonna say I'm the best.
My neighbor does naggery on the sidewalk. 'I have the best car!' 'I have the best lawn!' I'm gonna say I have the best everything.