Similar to a rusty trombone but you put your eye up to the gentleman's anus instead of your lips. Use the penis like an ocular piece by twisting to adjust focus.

Warning: leads to conjunctivitis.
Bill and John were just horsing around when Bill gave John a rusty telescope. John laughed when Bill went to adjust his "focus"
by Ziglerfish February 9, 2012
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After having serious anal sex with your partner, ram your shit covered dick into their eye socket. Resembling a telescope
Suzie saw the hershey highway through my rusty telescope and was able to name a new galaxy. "The Peanut Galaxy.
by Cworth28 April 20, 2009
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