Combination of "silly" and "large". Used to describe achievement/act/incident of great significance. Most likely to be found in the lexicon of students at the University of St Andrews, where the term originates.
"Shagged that bird from last night, she was a solid 7 #sillarge"

"Just won 10-1 at FIFA, not even one of them was a Jew Goal. Sillarge."

"Went through a whole series of Game of Thrones last night, sillarge."
by RicYaz191 May 4, 2014
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