The term you use when you use the upper lining of your shorts/underwear/trousers to support your penis so as to conceal your early morning boner.
Used when you want to prevent awkward conversations with your parents/siblings or any other person around you when you wake up!
Jim: man how come you never get caught with a boner by your wife in the morning?
Tom: looks like you are unaware of the secrets of the invisiboner!
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