"Now now" is a phrase commonly used to express impatience or urgency. However, there are several synonyms that can be used in its place. For instance, the phrases "immediately," "right away," or "at once" can be used to convey a sense of urgency. Additionally, the phrase "in the moment" can be used to communicate the importance of acting quickly. Other possible synonyms include "pronto," "stat," "asap," or "lickety-split." Ultimately, the most appropriate synonym depends on the context in which it is being used. Choosing an appropriate synonym can help to convey the necessary sense of urgency or importance.