A stick or 'throwing bolt' shuriken.

know well, be familiar with, be well informed about

thorough knowledge of

(weaponry) shuriken, throwing star (a ninja weapon)

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend

a staff, measuring 6 shaku (about 1.8 meters), used in martial arts such as 棒術 (bōjutsu) / (by extension) stick-like or long, cylindrical item: pointer, pole, rod, etc.

bar, staff, stick, pole, walking stick, cane, stave, strove, rod, wand, (shepherd's) crook. / straight line.

(Internet slang) Used at the end of a phrase to indicate flat or deadpan intonation.