The alias or stage name frequently used by the musician Frank Iero. This usually coincides with his signature symbol of a cross with three dashes and serpents on the bottom, resembling an anchor. Frank Iero is commonly known for being the guitarist in My Chemical Romance, but FRNK shows up more in his recent work with Frank Iero andthe celebrations or Frank Iero andthe Patience.
Person A: What's Frank Iero's Twitter?
Person B: frnkiero
Person A: rad
by FanFicPanda March 2, 2017
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Free-Range Neighbor Kids: the group of unruly suburban children that run in a pack through a neighborhood. Parents showing weakness to the FRNKs are subject to refrigerator raids and a dozen kids sitting on good leather couches in wet swimsuits to watch cartoons. The FRNKs leave home in the morning, and and rarely return to their own home before the streetlights come on in the evening. Although their adolescence is reminiscent of the Lord of the Flies, FRNKs generally grow up to be well-adjusted, independent, problem-solving members of the community.
Mom: I just bought a case of mini-pizzas. Where ARE they?

Dad: I saw the FRNK's in our back yard earlier....

Mom: Oh. That explains it. Where is that case of gatoraid?
by The Mom Next Door September 25, 2011
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