It's his idea of a joke, I suppose, the scallywag.是什么意思？

It's his idea of a joke, I suppose, the scallywag.

我想开玩笑是他的主意，真是个淘气鬼。

his

pron. (he的所有格)他的，(he的物主代词)他的东西；det. 属于他的，用于名词前，自己的，指某人的，上帝的；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

idea

n. 主意，想法，[哲]理念，观念，[乐]乐句，模糊想法；

例句
It is often a good idea to start with smaller, easily achievable goals.
一开始把目标定得低一点、容易实现一点，总不失为一个好主意。

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

joke

n. 笑话，玩笑，笑柄，笑料；vt.& vi. 开玩笑，戏弄，闹着玩，说着玩；

例句
It's bad enough to have anyone joke about such a serious matter but a member of the police force should know better.
拿这么严肃的事情开玩笑已经够糟的了，身为一名警察更不应该这样做。

suppose

vt. 假定，猜想，推测，认为，让（用于祈祷语气）；vi. 想象，猜想；

例句
I suppose the shock had addled his poor old brain.
我估摸这个打击已经把他那可怜的脑袋瓜搞糊涂了。

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

Scallywag

n. 饭桶，无赖汉；