Plab is just another word you say to express your feelings like 'groovy' or 'rad' and 'awesome' even 'cool', just better. There are other words that branch off of plab such and plabfulishious, very plab, unplab, plabtastic, plexy, etc. the possibilities are endless!!!! just get creative and use the word plab!
"oh man that roller coaster was plabtastic!"
"you are so plab!!!"
"betsy is so mean!!"
"i know she is unplab!!!"
"Oh my gosh, you are so plexy"