Top Definition
1. To be sexually aroused in a way associated with exercise.

2. To become erect in a way that completely disregards your previous length of penis.
1. Bro I was running sprints with DST last week and bam it hit me. I was fuckin unyielding, I came my pants dude.

2. Me and Arianna were fucking last night and then I felt something different, I got unyielding. I swear my 6 inch cock changed to 8 inches and she was moaning her ass off.
by RelenterDST June 09, 2016
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