My funny mistake - diskuze

Here it is.I remember one of my mistake.It was around a lot of people on one party from my job there.I wanted say to one of my colege that he is very "vysoky" and I used the word HIGH. He started laugh,same as other people in the room.I felt so stupid.I corected myself and used the right word tall, but nobody hear it because they were laughing. For sure it was wrong gramm - (people are tall, mountains can be high)But what worse.When they say to someone he is high, they mean someone is "zhuleny" or anything else that has to do something with using drogs.I didn't know it. What a "trapas"