SICL
SICL definition by Slang.net
This page explains what the acronym "SICL" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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Those who are both sitting down and busting a gut may send you SICL. This acronym stands for "sitting in chair laughing."
Most often, people use SICL when replying to humorous messages they've received at work. For example, if you send your GF a funny video while she's sitting in her office, she may reply with "SICL!"