Oxford English Dictionary], Second Edition, Addition Series 1993 (plural si), and is also a short form of seisiun, a word used by the Irish. Generally, sesh refers to a period of time spent engaged in some group activity.
双语例句
1
Wife: Everything already is different, Sesh.
妻子：一切已经不同了，塞希。
2
The trick here, though, is to get out of bed and shower promplty post-pleasure-sesh.