When you slide your boner up, around and then under your belt as to conceal it from unsuspecting bystanders, resulting in a perpendicular formation between said boner and belt. Often performed through manipulation of the boner through a pants pocket, but when done professionally, direct contact can be performed inconspicuously as well.
"I had a raging boner today in class, thank god for the Holy Cross when it came time to stand up to do my presentation"
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