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It is similar to the definition of for-sure. However, forsurf means that you will commit depending on how passionate you are about the topic at hand. One can either be extremely eager or on the fence about the the answer they want to give, only a true friend can translate the forsurf conviction of the example.
Hey kyle you want to drink a 40 and watch fubar?

Forsurf man!
by deanerrrr June 29, 2010