Is it weird for a girl to give a guy a hickey?

It's not weird for a girl to give a guy a hickey; it ultimately depends on the individuals involved and their comfort levels. Hickeys are often seen as a sign of affection or attraction, and if both parties are consenting and comfortable, it's perfectly fine. Social norms around such displays of intimacy can vary, so what's considered "weird" may differ from one context to another. Ultimately, communication and mutual consent are key.