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A very common sight among swim teams everywhere. Most likely to be seen in a crowded lane involving at least 5 people. Wall Grinding is the act of getting so close to the person next to you that it appears that you on grinding on them. Can be very annoying and in most cases there is at least one wall grinder in every lane.
Boy: Hey is that your boyfriend over there in lane 1?

Girl: Yeah, so what?

Boy: Well maybe you should stop wall grinding on me before he gets upset! This is not a school dance! This is swim practice!
by TheOriginalBigNate April 25, 2011
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