SCAT

(informal) quickly; very fast (possibly from the term ss'cat, a hiss followed by the word cat used in driving away cats). —SHSBC Binder 15 Approved Glossary, —SHSBC Binder 31 Approved Glossary

with more than ordinary speed. (informal) quickly; very fast (possibly from the term ss'cat, a hiss followed by the word cat used in driving away cats).