A misspelling of filter, but surprisingly doesn’t have a meaning.

Or could mean “Dad I’d Love to Eat Ravenously” as an acronym.
Damn Maggie, your dad is a DILTER, is he single?
by Losers Club b June 6, 2021
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A fan of the Danish Television series John Dillermand.
"I'm hooked. Call me a Dilter. I can't stop watching John Dillermand!"
"My friend Kyle is a Dilter, too! We both started watching John Dillermand about the same time."
by Reeps February 9, 2022
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