alot of people use slang like this, tagging the penis tag with "shaft" instead.

Not only used for penis

shaft (ʃæft, ʃɑft)

n.
1. a long pole forming the body of various weapons, as lances or arrows.
2. something directed at someone or something in sharp attack: shafts of sarcasm.
3. a ray or beam.
4. a long handle serving to balance or manipulate a weapon or tool, as an ax or a golf club.
5. a rotating or oscillating rod that transmits motion and torque, as a ship's propeller shaft or the drive shaft of an automobile.
6a. the part of a column or pier between the base and the capital.
6b. any distinct, slender vertical masonry feature engaged in a wall or pier and usu. supporting an arch or vault.
7. a monument in the form of a column, obelisk, or the like.
8. either of the parallel bars between which the animal drawing a vehicle is hitched.
9. any well-like passage or vertical enclosed space, as in a building.
10. a vertical or sloping passageway in a mine that leads to the surface.
11. the trunk of a tree.
12. the main stem or midrib of a feather.
13. Slang. harsh or unfair treatment.
v.t.
14. to push or propel with a pole.
15. Slang. to treat in a harsh or treacherous manner.
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Mario583 said:
Not only used for penis

yeah, but thats what its being used for as far as i can tell
the same people tend to use other words that dont fit, like hot when the character isnt sweating (or in these cases "hawt") escetra