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The expression you get when you inhale the very last tobacco in your filter cigarette. The red-glowing tobacco usually causes the filter to heat up instantly, transfering painful heat to your lips.
Can also be used in a negative term to offend someone:

"Jonnern has a permanent filter face".
"If I had a filter face like yours, I'd kill myself."
by fatti May 15, 2005
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An average-to-unattractive person who relies on social media photo filters to drastically improve his/her appearance.
"I was excited to meet that girl from OkCupid - she looked SO hot in her pictures - but she turned out to be a real filter face. Total disappointment."

"Sure, his new girlfriend looks pretty on Instagram, but have you met her? She's got a serious case of filter face."

Tai: Do you think she's pretty?
Cher: No, she's a full-on filter face.
Tai: What's a filter face?
Cher: It's better in pictures, see? On social media, it's OK, but in-person, it's a big old mess.
by okk385 May 27, 2014
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