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the blood that flows to the penis when excited sometimes resulting in a nudge of the penis or a full erection.
jimmy: hey stewie, "did you see mrs. chang's panties when she bent over to pick up the chalk? it gave me knob flow"

stewie: " i second the knob flow, any longer and i would of spontaneously jizzed on myself."

jimmy and stewie in unison: "thx mrs. chang for the knob flow show"

mrs. chang: "herro class, today we will learn......".
by mr. knob johnson September 10, 2010
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