SAG ALONG to walk slowly ...Bk1913-17 Amer. dial.
SAUSAGE a German ...1890 sl.
SAWDUSTY without profound meaning or interest; tiresome
SCABROUS full of difficulties
SCABROUS indecent or scandalous; risqué; obscene
SCALLY a young man who may range from a lovable rogue to a hooligan ...Brit. sl.
SCALLYWHAMPUS splendid, fine ...Bk1913-17 Amer. dial.
SCALP ONE FOR A JAY to dupe, to swindle ...1890 sl.
SCALY-BACK a treacherous, untrustworthy person ...Brit. sl.
SCANTIES very brief underpants, esp. for women
SCATTER GUN a machine gun ...Bk1944 service sl.
SCATTER GUN the anus, esp. when the owner has diarrhoea ...Brit. sl.
SCATTERS a bout of diarrhoea ...Brit. sl.
SCHINDLER'S LIST drunk...1990s Brit. rhyming sl. for 'pissed'
SCHLEMOZZLE a luckless, accident-prone wretch ...Brit. sl.
SCHUSSLE one who in hurrying falls over his own feet ...Bk1913-17
SCROOCH DOWN to crouch down ...Bk1913-17 Amer. dial. 001AD
SCRUMBOTIOUS first-class, nice, fastidious; particular, excellent, fine, delightful ...Bk1913-17 Amer. dial.
SCRUMBOTIOUS scrumptious ...Bk1913-17 Amer. dial.
SCULPIN a scalawag; a rascal ...Bk1913-17 Amer. dial.
SEE THE MONKEY DANCE to see novel and entertaining things ...1863 Amer. sl.
SEND TO THE RIGHT-ABOUT to dismiss ...1842 sl.
SEPTIC TANK an American ...1976 rhyming sl., chiefly Aust., for 'Yank'
SEQUELTERED sequestered and sheltered ...Bk1913-17 Amer. dial.
SET-HEADED headstrong ...Bk1913-17 Amer. dial.
SHALLOW-PATE a person having no depth of intellect or understanding
SHALLOW-PATED having no depth of intellect or understanding ...arch.
SHAMATEUR (derogatory) a sportsman or sportswoman who makes money from sporting performances and appearances while officially retaining amateur status ...L19
SHAMBOLIC chaotic, disorderly ...L20 colloq.
SHAMBOLIC inept, mismanaged ...L20 colloq.
SHAMMOCK a lazy, slovenly person ..E18 chiefly Eng. dial.
SHAMMOCK a starved, miserable-looking person or animal ...E18 chiefly Eng. dial.
SHAMMOCK to walk with a shambling, awkward, or unsteady gait; to slouch, to dawdle, to idle about ...E18 chiefly Eng. dial.
SHEEPSKIN a diploma ...colloq.
SHELLAC to defeat; to trounce ...sl.
SHELLAC to thrash soundly ...sl.
SIFFER one who drinks a great deal ...Bk1913-17 Amer. dial.
SINCE HECK WAS A PUP for a long time ...Bk1913-17 Amer. dial.
SING FROM THE SAME HYMN SHEET to present a united front in public by appearing to agree with one another
SINGED CAT a thing which proves to be better than its appearance suggests ...US
SLAP-HAPPY dizzy, orig, from being punched ...1936 sl.