When we first learn English, we often joke and explain.

The Chinese word "noisy" means: not quiet (such as downtown); Play (as play); To occur (as a flood); Full of energy and momentum (such as the Lantern Festival); Vent and attack (such as losing your temper); Disturb, annoy, etc.

In this sentence, it means "happened": when we first learned English, jokes often happened, that's what it means.