Top Definition
A person who is obcessed with using periods in Instant Messages. Typically uses improper grammar with the only punctuation being periods. In some cases, the periods come between words, as a comma would.
Periodisiac Example 1: "dang. that was awesome. wow."

Periodisiac Example 2: "lol..haha..awesome.."
by MCV August 18, 2006
5 Words related to periodisiac

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