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This is the same as an Eremi and refers to your penis when it is between the semi-hard stage and a full erection.

It's not quite a semi and not quite an erection - it's a semection.
Example 1:
Girl: "Have you got a hard on!?"
Guy: "No"
Girl: "Yes you do!! It's bigger than a semi"
Guy: "I have a semection!"

Example 2:
"Lying beside this girl in bed it may have looked like I was semi'd up but I had a full semection on the go, if she was naked I would've had an erection."
by Superman and David H March 29, 2010

Words related to Semection

erection-semi eremi half erection semi stubby.