Those are Russian cards. The "B" is read as "V" in Russian, and stands, here, for valet, which is a (transliterated) cognate in English, since both languages loaned the word from French.
As a verb, to isle can mean "to place on or as if on an isle". An example from literature is "You are isled from accustomed cares and worries - you are set in a peculiar nook of rest." (The Pagan Papers by Kenneth Grahame)
For everyone looking for the hidden code, read the answers of the top 3 boxes left to right (ASK). Then, go down a box and read right to left (AND). Just keep doing that, 3 letters per row. Not the best explanation, but hopefully you get it.
As slang it's only an abbreviation of a real word, like app or vet.
Also, "jawful" and "pawful" ought to be accepted in addition to "lawful," or else the question should be revised to something else...