extremely; exceptionally; super
Colloquial phrase used to emphasize a high degree, often in the pattern 超がつくほど. Literally 'so much that you could attach the character 超 (super) to it'.
See also: 超
He is an extremely serious person.
This ramen is exceptionally delicious.
Standard kanji spelling; 超 is the usual character for 'super' or 'ultra'.
Variant with 付く; both spellings are used, but つく is more common.
From the idea of attaching the character 超 (super) to something to emphasize its extreme degree. The phrase is a colloquial expression that became popular in modern Japanese.