Formal/Romantic:
* Um beijo grande: This literally translates to "a big kiss" and is a good choice for a more formal or romantic setting.
* Um beijo enorme: This means "a huge kiss" and emphasizes the size of the kiss.
* Um beijo apaixonado: This translates to "a passionate kiss" and is more romantic than the others.
Informal/Playful:
* Um beijinho grande: This is similar to "a big kiss" but more playful and casual.
* Um beijinho enorme: Similar to the above but with more emphasis on the size.
* Um beijoca: This is a slang term for a big kiss and is more informal and playful.
Important Note:
* The best way to convey the meaning of "big kiss" in Portuguese will depend on the context and the relationship between the people involved.
* Consider the tone you want to set and choose the phrase that best fits the situation.
Let me know if you need more translations!