dog Latin—bad or inferior Latin:
- They [speeches] are chiefly made up of extracts from the common school collection … sprinkled with scraps of dog Latin.
pig Latin—a jargon formed by rearranging the syllables in a word:
- The great thing about speaking pig Latin is that it’s not simply a question of learning a new vocabulary.
Note: Neither expression correlates in meaning with the phrase thieves’ Latin—(arch.) the cant of thieves:
- I … saw a light inside, and heard two words of thieves’ Latin.