美国俚语学习（j 字母开头）

jack around	waste time	All you do is jack around every day.
jam	trouble	I am glad you got yourself out of that jam.
jam	play music	I really like to jam with this jazz group.
jamming	good	This concert is really jamming.
jerk	stupid person	That guy is such a jerk.
jillion	an infinite number of	She can eat a jillion cookies.
jock	an athlete	My roommate is a jock for the basketball team.
john	toilet	The john really smells.
joint	bar	Where is the closest joint to here.
joint	marijuana cigarettes	He is good at rolling joints.
junkie	drug addict	Sam is a junkie.