A surfing term. When there is not a wave in sight you may still decide to take your surf board out for a "grovel".
1.
Hamish: Have you seen, Mal's out grovelling and its like a fucking lake.
Gav: Yeah he's king of the grov!
2.
Mal: Mick, you coming for a grov?
Mick: You gotta be fucking kidding!!
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