They will not actually steal, but they will cheat you every time and chortle over it.
Another of Lewis Carroll's words, chortle, is even more used.
They can yawp and chortle and call me Skyrider as if it was a joke.
It rose again—it was like a perplexing cheep and chirrup, changing to a chortle of glee.
A dirty, yellow hand seized the bag; there was a chortle of exultation, ...