when a female whom you do not like or find attractive is riding you and you lose your boner. so the takes a cucumber or her fist and starts beating you to death
duder 1: bro, i fucked the ugliest chick in the world last night, she was so ugly that she dirty speared me.

duder 2: but i though that was technically impossible when having your penis stimulated.

duder 1: also the inside of her vagina made me think about Burt Reynolds

duder 2: holy fuck.

lurkin duder 3: the thought of receiving a dirty spears turns me on
by gabeisintheoffice January 22, 2009
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When a person has a log of stool in their anal cavity and another person shoves their penis into the anus. When pulling their penis out the stool is then stick to the tip of the penis giving them a dirty spear tip
"Fuck man! Danica gave me a dirty spear tip last night when I tried surprise butt sex with her"
by Papa Kraus March 12, 2018
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