An ego trip - When you try to show your importance and when you want others to feel your importance, then it is called an ego trip because ego is the thing which defines excessive pride and eagerness to get value for oneself from others.
1. Spending money on girls was an ego trip from Ishant.
2. Well, don't you think you are making an ego trip by showing off your phone?
3. I don't mind that ego trip of hers anyway, because it's her habit.