Verbal irony is when what is said is the opposite of the literal meaning. One type of verbal irony is sarcasm, where the speaker says the opposite of what he or she means in order to show contempt or mock. Other types of verbal irony include overstatement (or exaggeration) and understatement.
Thanks for A2A. There are two excellent, well-informed answers here, so I'll just try to simplify. Dr. Falconer is of course correct; pre-weaning age (about 9 weeks or younger) kittens can drink cow's milk, or any milk. Neonates are not lactose intolerant; this develops gradually with age.
When her kittens are weaned and her milk dries up she can get pregnant again. When the kittens are about 6-8 weeks old you need to get her spayed before letting her out. Don't rehome the kittens till 8-12 weeks old so mom can teach them survival and social skills they'll need to become well adjusted cats.