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.
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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.
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