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When you hold someone down, cover their mouth, and blow air into their nose so that it feels as if their brain is being "invaded". Fun way people annoy their younger siblings, along the lines of the wedgie or the wet willie.
When she held me down and gave me a brain invasion my head felt like it was going to explode.
by BabyAly1 September 17, 2006

Words related to brain invasion

air annoying brain braininvasion invasion wedgie wet willie