A semi-erect penis. The word has its origins from the equestrian world.
I always awake with a clop-on.
Bessie had a raging clop-on as I brushed him down.
by clop-on April 04, 2009
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"Last night I heard a strange sound coming from the other room."
"What did it sound like."
"Clop clop clop."
by Zaeglamesh April 26, 2014
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Like fap fap, except when it's done by bronies (adult male fans of the kids show "My Little Pony: Friendship is Magic") while watching My Little Pony porn.
Brony 1: Hey dude, what took you so long?

Brony 2: Oh, um, well I saw some pretty hot Fluttershy drawings online, so, you know, clop clop. ;D

Brony 1: D:
by FatKidOnline May 24, 2012
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When a bronie is masterbating to Twilight Sparkle and Rainbow Dash going full lez on PonyHub in his moms basement at 4am.
Twilight Sparkle: "Spank me harder Rainbow Dash!"

Rainbow Dash: *whip* *whip*

Bronie : "This is good clopping material

Bronie: *clop* *clop* *clop*
by CuckedAF November 17, 2016
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Brony 1: Dude, I just caught George clopping to Fluttershy!
Brony 2: Fluttershy?! Man, that's just wrong!
by DrWhoof April 26, 2011
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