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An inkling of an erection. 1/2 a chubby, therefore 1/4 a full erection.
A half erect penis, either a result of being only partialy aroused, or being paranoid of being caught.
since a chub is a full erection that is thick in girdth, but not proportionate in length; a half chub describes anything between flacid and an all out boner.
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