语言学家对俚语没有简单明确的定义，但他们一致认为，俚语是一种不断变化的语言现象，存在于世界各地的亚文化中。俚语是一种非正式的词汇(单词、短语和语言用法)，常见于口头交谈，但在正式写作中避免使用。因为俚语并不总是从字面意义上讲得通，所以您需要熟悉每个俚语的意思和用法。英语俚语是日常英语的重要组成部分。
儒琴今日英语俚语 （English Slang of the Day)
off-color joke / off-colour humour blue humor/ toilet humor / scatological humour / risqué humor/ gross-out humor /
An ” off-color joke ” is defined as a joke that exhibits indecent or poor taste.
低级趣味笑话/幽默
off-color joke / off-colour humour blue humor/ toilet humor / scatological humour / risqué humor / gross-out humor 涉及的话题可能被认为是在低级趣味或过分庸俗。许多喜剧体裁可以融入这类庸俗元素。最常被贴上“off-color”标签的是与性别、特定民族或性别有关的行为; 其它话题包括暴力，特别是家庭虐待；过分的咒骂或亵渎；民族优越感或自卑感、恋童癖内容等任何话题。
Emboldened by an enthusiastic reception from Hollywood’s gay elite, President Barack Obama made what appeared to be an off-color joke about his wife and Ellen DeGeneres during a fundraiser last night.
— business inside June 12, 2012
give sb a heads up
have a heads up (or heads-up)
heads-up: an advance warning of something.
to tell someone that something is going to happen; an advance warning of something.
事先提醒（某人）; 事先得到提醒或警告
Why did Trump give a heads up to terrorists by letting them know New Muslim Ban was coming today?
Asked if he had a heads up Bolton would be fired, Graham said: “I know there were some concerns about the whole Taliban meeting, but I didn’t know for sure.
road hog
noun [ C ] informal disapproving
A driver who takes up too much space on the road, making it difficult or impossible for other drivers to pass.
行驶中，占用道路空间过大的司机，使其他司机难以或不可能通过；不顾及别人安危横冲直撞的驾驶者
Many morning commuters became frustrated at the road hog straddling two lanes.
The police need to take more notice of these cyclist road hogs.
MIDDLE lane road hogs are the most irritating drivers, RAC pollsters were told, in a survey for National Courtesy Day last week, which possibly explains the escalation in road rage incidents.
cattle call
A large audition (for film, television, theater, etc.) that is open to everyone many of whom are inexperienced.
[娱乐行业用语]招募临时演员的面试会 ；集会
Nineteen presidential candidates traveled to the New Hampshire Democratic Party convention for the state’s first cattle call before the 2020 primaries. Here are some things to know and to look for during speeches Saturday.
I spent days preparing for the audition, but it turns out it was just a cattle call and they ushered me out before I was even halfway done with the monologue.
During the cattle call, candidates will be given ten-minutes on stage to address the crowd; the time-limit will be strictly enforced.
