Most of the time used as a unisex nickname of people having subramanium or Subramanian or subhalakhshmi or similar names as their name. Rarely not South Indian.
Guy 1: you know Subbu looked really hot today.
Guy 2: the guy or the girl.
Guy 1: YES.
The cutest and most ungrateful creature to exist on the face of the plant. Everyone falls in love with him and forgets everyone else. Loves chicken and hates cuddles, a true heartbreaker. He will make you make your whole life about him. Sleeps at odd times and demands attention at 5 am.
All I think about all day is how cute he is. He is like a Subbu