PDA
PDA (noun) means Public display of affection: kissing, cuddling or similar behaviour between partners in a public place. Example: “They are not big on PDA.”
How to use PDA
Learner’s notesIn plain EnglishBeing affectionate with a partner in public.
Fill the gap
Can you complete this real example?
They are not big on _____.
Etymology
An initialism with two unrelated expansions; the "public display of affection" sense is now much the more common in everyday use.