This is a term that is used when referencing the act of having sex with a woman while she's on her period. Sharks attack women who are menstruating in the ocean, and since you are having sex with a woman's bleeding vagina on the land, it is called 'land sharking'. It can also be called a 'shark attack' and is often accompanied by the Jaws theme song and a hand smacking motion immitating the clamping of sharks' jaws.
This should only be attempted if...
A) one is extremely horny
B) one is extremely commited
C) one is both extremely horny and extremely commited
Latisha's on her period, but I'm so damn horny. I think I might land shark her anyway.