Like other forms of the word "hey", this one is inherently sexual. "Heeyyy" implies that the recipient should tie themself to the bed and await the sender's arrival.
A common greeting used through text messaging, usually indicating the person sending it has a high level of interest in you. The higher amount of letter y's in the "hey", the higher the thirst this person most likely has for you. If over three y's, the sender has a complete and extreme level of interest in you, and can be considered a giveaway that they would like to bang you over a piece of furniture in the near future.
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.