When someone calls you "grasshopper," it is often used as a term of endearment or affectionate nickname. The term originates from Eastern philosophy and popular culture, particularly from the TV series "Kung Fu" that aired in the 1970s.
In the TV show, the main character Kwai Chang Caine, played by David Carradine, was a martial arts master who was often referred to as "grasshopper" by his wise teacher, Master Po. The nickname "grasshopper" was a metaphorical reference to Caine's humility, teachability, and willingness to learn and grow. Master Po saw him as a student with potential, and the name reflected the relationship between a wise mentor and an eager disciple.
Thus, when someone calls you "grasshopper" in real life, they might be playfully using the term to indicate that they see you as a learner, someone who is open to guidance and wisdom. It can also be a way of expressing affection or fondness, similar to calling someone "dear" or "sweetheart." It's generally used in a lighthearted and positive context to highlight qualities like curiosity, humility, or receptiveness to learning and personal growth.