To shove someone's head by placing an open palm on the person's face and pushing. Similar to a slap, but without the speed and with the force directed forward rather than sideways; typically used to escalate a verbal argument just before coming to blows. It's the most offensive thing you can do to a person without causing them pain.
You can't face-mash a guy without expecting to get punched in the face.
by Aaronomus November 25, 2013
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The act of kissing someone on the mouth repeatedly for an extended period of time, making out.
Yo bro wanna mash faces right now? No homo.
by Peeniss March 7, 2019
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So a girl name "Julianne" spelt face mask in EPP wrong
by Zero 200 November 16, 2022
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