subliminal advertising

22 LETTERS · STARTS WITH S

subliminal advertising is a valid 22-letter word worth 30 points in Scrabble and 39 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

S1U1B3L1I1M3I1N1A1L1A1D2V4E1R1T1I1S1I1N1G2

1 + 1 + 3 + 1 + 1 + 3 + 1 + 1 + 1 + 1 + 0 + 1 + 2 + 4 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 2 =30 PTS

DOUBLE WORD → 60TRIPLE WORD → 90

MEANING

What does subliminal advertising mean?