Brought sand to the beach and we left with your bitch

from TDE (Ft. Ab-Soul, Isaiah Rashad, Jay Rock, Kendrick Lamar & ScHoolboy Q) – BET Cypher 2013 Lyrics on Rap Genius

Meaning

Bringing sand to the beach is a metaphor for bringing a partner, (usually female), to a place where there are already a ton of, (typically), women available. Not only did he bring women to the beach, (or club/party/whatever), he left with your girl. Jay-Z had a similar line in Beach is Better:

I brought sand to the beach cause my beach is better
You can keep ya beach cause that beach whatever

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