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1680s, probably from earlier suffe (1590s), of uncertain origin. Originally used in reference to the coast of India, hence perhaps of Indic origin. Or perhaps a phonetic respelling of sough, which meant "a rushing sound."
Yes; certainly; willingly: Sure thing I'll go with you (1896+)
("Internet surfing") Used by analogy to describe the ease with which an expert user can use the waves of information flowing around the Internet to get where he wants. The term became popular in the early 1990s as access to the Internet became more widespread and tools such as World-Wide Web browsers made its use simpler and more pleasant.