Oh, you want blunt? I'm feeling very blunt tonight. You ride the bike for a while....and suddenly you realize you can't feel your cock. Like it ain't there. Gone. Kaput. Fell off, slid down your shorts, and is lying on the road back there somewhere for all you know.
That's what 'numb' means.
This numbness may continue for hours after your ride, or even days. Maybe...permanently.
I recommend avoiding even short term numbness of this type. Adjust the saddle position, replace your current saddle with a saddle that causes zero numbness, or stop riding entirely. I mean, dude...it's your COCK!!!!
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Coach Bill