Literally: To be on the cleat
Meaning: To be going flat out / to be going full throttle
Origines: The word ‘taquet” evolved through the centuries, originally 15th century it was a door blocker, so the sense to block something. Figuratively speaking in the 19th-20th centuries, evolved as ready to go full throttle. Slang gives a different sense un taquet is a smackdown the face. As a nautical term, since the 17th le taquet is a way to hold a cord in place.
Synonyms: se donner à fond; être au maximum; avoir atteint son maximum.
Examples: Regarde le ! Il est complètement absorbé par son travail. Ouais, il est vraiment au taquet. Look at him, he is such a workaholic , yeah he really is going full throttle