Internet slang suffix attached to adjectives, verbs, or nouns to express excessiveness, similar to すぎる but with a humorous or exaggerated tone. Originates from the name of baseball player 杉内俊哉 (Sugiuchi Toshiya) combined with すぎる.
See also: 過ぎる
このラーメン、うま杉内！
This ramen is too good!
昨日のテスト、難し杉内だった。
Yesterday's test was so hard.
Internet slang. A blend of the name of baseball player 杉内俊哉 (Sugiuchi Toshiya) and the verb すぎる ('to exceed'). The suffix 杉内 is used to mean 'too much' or 'extremely' in a humorous way.