What does boop/boope means? (Is it a valid word)
Solution 1:
The mystery of the boop shall never be revealed. But when saying "Boop" you must poke a random person on the nose. urban dictionary
Why not in 'standard dictionaries'? That takes time ... time for the use of the word to fade away ... or enter the lexicon. May Betty Boop knows. Finally I did not mention bronchiolitis obliterans organizing pneumonia (BOOP)!
see 8 or so definitions ... all refer to the nose of animals, man included. You can see the 'votes' on each too. So boop to you!
Solution 2:
It's onomatopoeia, and yes could definitely be considered a 'cute' word (especially in the case of one 'booping' a puppy's nose, for example)
Solution 3:
Yes, to boop something is to lightly tap it on the nose.