quebra-gelo

Etymology
lit. 'breaks-ice'.

Noun

 * 1) icebreaker ship designed to break through ice
 * 2) icebreaker game, activity, humorous anecdote, etc. designed to relax a group
 * 1) icebreaker game, activity, humorous anecdote, etc. designed to relax a group

Usage notes
quebra-gelos may be used as the plural of quebra-gelo or as a singular synonym.