He is getting up to all sorts of high jinks, sir, what is unbecoming to a house-elf.
他整天就知道寻欢作乐，先生，这对一个家养小精灵来说是不合适的。
英语百科
High jinks
High jinks was a popular 18th century drinking game in Scotland. The game involved throwing a die, and if the caster got a bad score, they had to choose between drinking more alcohol or performing an undignified task.
The term "high jinks" is now commonly used to refer to any prank or frolic.