The phrase "pull fast on" can be replaced with a number of synonyms depending on the context in which it is used. Some of these synonyms include yank, tug, drag, haul, jerk, and wrench. All of these words imply a forceful and quick motion, although they may differ slightly in connotation. For example, "yank" may suggest a sudden and forceful pull, while "drag" implies a slower and more deliberate motion. "Haul" and "wrench" both suggest a more difficult or strenuous effort, requiring more force and strength. Ultimately, choosing the right synonym for "pull fast on" depends on the specific context in which it is used, as well as the desired tone and emphasis.