Body Language Doctor. A BLD is a person who has a fantastic amount of success in studying the probability of two people fucking based on their body language. BLDs are born to help. They are selfless and often find themselves neglecting their own love lives in order to give direction to the relationship-needy. The common practices of a BLD are similar to that of a free mason; nearby BLDs meet every once in a while to discuss recent hook-ups, break-ups, and fuck-ups within the thirsty community.

When you're being horny (especially around friends) and as a result shame ensues.

Big Long Dick

Shortened down to BLD it can also mean Black Long Dick.
Usually describes a man's dick.

breakfast, lunch, and dinner. something that occurs all day long. phrase used in the act of taunting another

Black Dick (that shyt that white girls love)

Bad Life Decision.
Not to be confused with the ever popular fml moments. Bld is more the things that lead up to the extreme side of things such as the fml moments. Its the opposite of a GLD(good life decision)