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One of two things;

1. A man who masturbates to horses, especially 'My Little Pony'.

2. A horse who just masturbates full stop.
That guy totally looks like a Clopster

We walked in on Mick the other day, turns out he's a Clopster.

Reggie's horse is an excessive Clopster.
by Slydog12 January 02, 2012
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